A lot of fans consistently rate Pokémon OmegaRuby and AlphaSapphire (ORAS) as among the best (if not the best) Pokémon games in the franchise. The rerelease garnered an intense love of Hoenn, its Pokémon, and, surprisingly, the story. But what makes ORAS so amazing is that it gives trainers a chance to catch Pokémon with Egg moves and hidden abilities but also Pokémon not found in Hoenn. These National Pokémon, unlike a plethora of other games, can be caught before the Elite Four! As such, these games are fantastic for a Monotype Run (or Single Type Run). For this article, I’ve included all Hoenn games so Pokémon Ruby, Sapphire, Emerald, and ORAS.

Rules

1. Only Pokémon of a certain type may be caught and trained.
2. You must catch the first Pokémon available of that type if your starter does not match that type (you’ll then have to discard that starter).
3. You may train a Pokémon that evolves to said type as long as you do it ASAP.
4. No out-of-game trading allowed.
5. Mega Pokémon count as long as you Mega Evolve them as soon as they appear on the battlefield.
6. Only Pokémon caught before Elite Four are counted.

The Best Types

The Hoenn games may just be the best games in the series for a Water-type run. You have an abundance of Water Pokémon with substantial diversity. Mudkip’s Water/Ground evolutions neutralizes the Electric weakness and gives some strong moveset variety. From there, you can train Magikarp/Wingull, Tentacool, Carvanha/Corpish, and more! If you have Sapphire, AlphaSapphire, or Emerald, you can even catch a Lotad early on and have it alongside Mudkip and Wingull before the first gym!

Ground, Psychic, and Flying are other excellent types as well. Although you won’t get much diversity for Ground Pokémon, you’ll still have the likes of Swampert, Flygon, Claydol, Camerupt, and Rhydon to play around with. The Psychic type has better diversity as you can catch and train Ralts, Meditite, Staryu, Natu, Solrock/Lunatone, and Girafarig. The Flying type, like Water, can give you early diversity but also provide some great hitters later on like Skarmory, Salamence, Gyarados, and Crobat.

From there, there are a plethora of types that you can catch very early on but may lack substantial diversity like Bug, Dark, Normal, Fire, Grass, Fighting, Poison, Fairy, and Ghost. If you have an ORAS game, however, the late game availability of random, national Pokémon, gives these types a fully-fledged out team. I’d say out of these options for an ORAS run I would choose Bug and Dark due to constant availability of these Pokémon throughout the game mixed in with some stellar late game Pokémon like Volcarona, Hydregion, and Drapion.

 

The Worst Types

As Hoenn is a tropical island, Ice types are quite rare (only two families) and available very late in the game making them one of the worst types in the entire series to do a run on. Although not as difficult, Dragon Pokémon are rare and the first Pokémon you can catch would be a Swablu well after the third gym. However, ORAS significantly changes this as Sceptile’s Mega Evolution is Grass/Dragon which makes it available from the start. The Dragon type becomes amazing as you can catch the likes of Hydregion, Garchomp, and the Lati@s in these games (just watch out for Ice moves!). Finally, Electric type is rather poor in these games due to their lackluster diversity and the first one you can catch is after the second gym in ORAS (but you can skip Brawly in RSE by giving Steven the letter, go to Route 110, catch your Electric Pokemon, then fight him).

 

Type Teams

Bug
Ideal Team: Dustox/Venomoth (ORAS)/Beedril (ORAS), Heracross, Volcarona (ORAS), Forretress (ORAS), Galvantula (ORAS), Armaldo/Crustle (ORAS)
Optional: Pinsir, Beautifly, Shedinja, Ninjask, Leavanny (ORAS), Parasect (ORAS), Kricketune (ORAS)
First Pokémon: Wurmple via Route 101
Covers Weaknesses? Yes

Dark
Ideal Team: Crawdaunt/Sharpedo, Honchkrow (ORAS), Krookodile (ORAS), Drapion (ORAS), Hydreigon (ORAS), Scrafty (ORAS)
Optional: Absol, Mightyena, Umbreon (ORAS), Zoroark (ORAS), Mega-Gyarados (ORAS), Spiritomb (ORAS), Sabeleye (S, E, AS), Shiftry (R, E, OR)/Cacturne
First Pokémon: Poochyena via Route 101
Covers Weaknesses? Yes for all versions except Pokemon Ruby

Dragon
Ideal Team: Salamence, Flygon/Garchomp (ORAS), Mega Sceptile (ORAS), Dragalge (OR), Lati@s (ORAS), Hydreigon (ORAS)
Optional: Altaria, Druddigon (ORAS), Haxorus (ORAS), Rayquaza (Emerald)
First Pokémon: Besides Teecko in ORAS, you can catch a Swablu in Route 114 after the third gym
Covers Weaknesses? No, Ice is not neutralized and, unless you have a Mega Altaria, Dragon is not neutralized.

Electric
Ideal Team: Manectric, Magneton/Magnezone, Lanturn, Galvantula (ORAS), Jolteon (ORAS), Eelektross (ORAS)
Optional: Minun/Plusle, Electabuzz (ORAS), Zebstrika (ORAS), Electrode, Luxray (ORAS)
First Pokémon: Electrike, Plusle, and Minun can be caught at Route 110 after the second gym in ORAS (as well as Magnemite by Horde).  In RSE you can skip the second gym by giving Steven the letter, take the boat to Slateport, and capturing your Pokemon on Route 110.
Covers Weaknesses? Yes for ORAS but in Ruby, Sapphire, and Emerald, Ground is not neutralized.

Fairy (ORAS only)
Ideal Team: Gardevoir, Wigglytuff, Mawile (OR)/Klefki, Azumarill, Mega-Altaria, Clefable
Optional: Whimsicott, Sylveon, Mega-Audino
First Pokémon: Ralts via Route 102 before the first gym
Covers Weaknesses? Yes 

Fighting
Ideal Team: Blaziken, Breloom, Heracross, Medicham (R, S, ORAS), Gallade (ORAS), Scrafty (ORAS)
Optional: Machoke, Hariyama, Hitmonchan (ORAS), Hitmonlee (ORAS), Hitmontop (ORAS), Throh (OR), Sawk (AS), Gurdurr (ORAS), Primeape (ORAS)
First Pokémon: Torchic via starter
Covers Weaknesses? No, Flying is not neutralized.

Fire
Ideal Team: Blaziken, Camerupt, Magcargo, Ninetales, Volcarona (ORAS), Arcanine (ORAS)
Optional: Torkoal, Flareon (ORAS), Magmar (ORAS), Rapidash (ORAS), Ninetales (ORAS), Darmanitan (ORAS), Primal Groudon (OR)
First Pokémon: Torchic via starter
Covers Weaknesses? No, Water and Ground not neutralized.  In OmegaRuby, Water can be taken care of due to Primal Groudon’s Ability.

Flying
Ideal Team: Gyarados, Salamence, Swellow, Ninjask, Skarmory, Xatu
Optional: Beautifly, Masquerain (R, S, ORAS), Pelipper, Crobat, Altaria, Tropius, Honchkrow (ORAS), Drifblim (ORAS), Mega-Pinsir (ORAS), Mandibuzz (ORAS), Chatot (ORAS), Unfezant (ORAS), Pidgeot (ORAS), Braviary (ORAS), Rayquaza (Emerald)
First Pokémon: Wurmple via Route 101
Covers Weaknesses? Yes 

Ghost
Ideal Team: Shedinja, Sableye (S, E, AS)/Spiritomb (ORAS), Drifblim (ORAS), Trevanant (ORAS), Froslass (ORAS), Jellicent (ORAS)
Optional: Banette, Dusclops, Cofagrigus (ORAS), Mismagius (ORAS)
First Pokémon: Nincada in Route 116 before the first gym
Covers Weaknesses? Yes for Sapphire, Emerald, and ORAS.  However, in Ruby, Ghost and Dark are not neutralized.

Grass
Ideal Team: Sceptile, Brleoom, Shiftry (R, E, OR)/Cacturne, Roserade/Roselia (R, S, ORAS)/Vileplume, Ludicolo (S, E, AS), Cradily
Optional: Tropius, Trevanant (ORAS), Leafeon (ORAS), Sawsbuck (ORAS), Whimsicott (ORAS), Parasect (ORAS), Tangrowth (ORAS), Sunflora (ORAS), Cherrim (ORAS), Lilligant (ORAS), Maractus (ORAS)
First Pokémon: Treecko via starter
Covers Weaknesses? Yes for Sapphire, Emerald, and AlphaSapphire. In other versions, Ice is not neutralized. 

Ground
Ideal Team: Swampert, Rhydon, Flygon/Garchomp (ORAS), Krookodile (ORAS), Camerupt, Excadrill (ORAS)
Optional: Graveler, Donphan, Claydol, Whiscash/Seismitoad (ORAS)/Gastrodon (ORAS), Dugtrio (ORAS), Groudon (Ruby and OR)
First Pokémon: Mudkip via starter
Covers Weaknesses? Yes

Ice
Ideal Team: Walrein, Glalie, Glaceon (ORAS), Beartic (ORAS), Dewgong (ORAS), Delibird (ORAS)
First Pokémon: Snorunt via Shoal Cave, before 7th gym
Covers Weaknesses? No, Rock is not neutralized and Ruby, Sapphire, and Emerald are additionally weak to Fighting.

Normal
Ideal Team: Slaking, Swellow, Girafarig, Exploud, Wigglytuff, Dodrio
Optional: Linoone, Kecleon, Zangoose (R, OR), Sawsbuck (ORAS), Porygon (ORAS), Delcatty, Spinda, Stoutland (ORAS), Chatot (ORAS), Unfezant (ORAS), Bouffalant (ORAS), Raticate (ORAS), Ambipom (ORAS), Pidgeot (ORAS), Lopunny (ORAS), Braviary (ORAS), Purugly (ORAS), Cinccino (ORAS), Audino (ORAS), Ditto (ORAS), Persian (ORAS), Stantler (ORAS)
First Pokémon: Zigzagoon in Route 101
Covers Weaknesses? Yes

Poison
Ideal Team: Dustox/Beedril (ORAS)/Venomoth (ORAS), Crobat, Tentacruel, Vileplume, Dragalge (OR), Drapion (ORAS)
Optional: Seviper (S, E, AS), Swalot, Roselia (R, S, ORAS), Muk, Weezing, Garbodor (ORAS)
First Pokémon: Wurmple via Route 101
Covers Weaknesses? Yes except for Ruby, Sapphire, and Emerald where Psychic is not neutralized.

Psychic
Ideal Team: Gardevoir, Medicham (R,S,ORAS)/Gallade (ORAS), Girafarig, Xatu, Claydol, Slowbro (ORAS)/Starmie
Optional: Lunatone (S, AS)/Solrock (R, E, OR), Lati@s (ORAS), Grumpig, Espeon (ORAS), Bronzong (ORAS), Gothitelle (ORAS), Hypno (ORAS), Beheeyem (ORAS), Musharna (ORAS), Unown (ORAS)
First Pokémon: Ralts via Route 102 before the first gym
Covers Weaknesses? Yes, except Emerald where Dark is not neutralized

Rock
Ideal Team: Rhydon, Aggron, Lunatone (S, AS)/Solrock (R, E, OR), Magcargo, Relicanth, Armaldo/Crustle (ORAS)
Optional: Graveler, Cradily, Boldore (ORAS), Barbaracle (ORAS)
First Pokémon: Geodude and Aron (RSE only) via Granite Cave shortly before the second gym
Covers Weaknesses? Yes

Steel
Ideal Team: Aggron, Skarmory, Magneton/Magnezone, Mawile (R, E, OR)/Klefki (ORAS), Bronzong (ORAS), Excadrill (ORAS)
Optional: Forretress (ORAS), Klinklank (ORAS),
First Pokémon: In RSE, Aron via Granite Cave shortly before the second gym.  However, in ORAS, the second floor basement is blocked off and you need a Mach Bike to access it.  As such Aron is acquired after the second gym (as well as Mawile in OR).  The earliest Steel Pokemon you can catch in ORAS is a Magnemite via Horde Encounter on Route 110, also after the second gym.
Covers Weaknesses? Yes 

Water
Ideal Team: Swampert, Gyarados, Ludicolo (S, E, AS)/Lanturn, Tentacruel, Sharpedo/Crawdaunt, Slowbro (ORAS)/Starmie
Optional: Pelipper, Azumaril, Milotic, Whiscash, Relicanth, Walrein, Wailord, Vaporeon (ORAS), Jellicent (ORAS), Seismitoad (ORAS), Gastrodon (ORAS), Kingler (ORAS), Clawitzer (AS), Lumineon (ORAS), Alomomola (ORAS), Dewgong (ORAS), Barbaracle (ORAS), Kyogre (Sapphire and AS)
First Pokémon: Mudkip via starter
Covers Weaknesses? Yes