Pokémon Omega Ruby & Alpha Sapphire may actually offer the best EV Training experiences in any Pokémon game due to how fast and consistent it is.
Like its sibling, Pokémon X & Y, Super Training is an option, but it’s one that’s not really worthwhile unless you need to farm for Reset Bags to fully reset all EVs for a Pokémon or if you need certain items it gives you. It can be used to EV Train, but it isn’t recommended.
The fastest way to EV Train in Pokémon Omega Ruby & Alpha Sapphire is by far Horde Battles, which have you fight five wild Pokémon at once in a battle. Moves that target multiple Pokémon, such as Surf and Earthquake, hit all of the Pokémon in a Horde Battle, so you’ll definitely want a strong Pokémon with one of those moves available.
You’ll also need to have a Pokémon with the move Sweet Scent, which is a field move that can be used from the party menu to instantly summon a Horde Battle while you’re in tall grass or a cave. Pokémon like Illumise, Oddish, and Gloom can all learn Sweet Scent and are very easy to find.
Because of how the Exp. Share was changed in Generation VI, you can now equip the Macho Brace or, better yet, the Power Item of your choice to the Pokémon you want to EV Train while fighting all of the Horde Battles with one of your strongest Pokémon instead — ideally one that has a multi-target move.
Power Items are particularly good here, since they give +4 to the respective EV for each Pokémon knocked out, and since there are 5 Pokémon in the fight, that’s a lot of extra EVs. That’s why you’ll ideally want a set of Power Items to speed up EV Training substantially. The Pokérus is also strongly recommended, so if you don’t have it yet, ask around to see if someone will be willing to trade you the Pokérus.
EV Training Spots
Thankfully, in Omega Ruby & Alpha Sapphire, there is a 100% encounter for every single EV, making it extremely consistent. Just go to the respective area, throw up Sweet Scent, use a move like Surf, and repeat the process.
Have a single-target move available in case you need a smaller amount of EVs — you can just pick away one or two Pokémon in a Horde to finish your spread (you might also need to remove the Pokémon’s held item as well).
HP
- Whismur Hordes (Rusturf Tunnel — 100%) give 1 HP EV per Whismur.
Attack
- Shuppet Hordes (Mt. Pyre Inside — 100%) give 1 Attack EV per Shuppet.
- Machop Hordes (Jagged Pass — 65%) give 1 Attack EV per Machop. There are also Spoink Hordes (35%) in the area.
- Doduo Hordes (Safari Zone — 60%) give 1 Attack EV per Doduo. Other Hordes in the area are Oddish (35%) and Psyduck (5%).
Defense
- Sandshrew Hordes (Route 111 — 100%) give 1 Defense EV per Sandshrew.
Special Attack
- Oddish Hordes (Route 119 — 100%) give 1 Special Attack EV per Oddish.
- Spinda Hordes (Route 113 — 95%) give 1 Special Attack EV per Spinda. There are also Skarmory Hordes (5%) in the area.
Special Defense
- Swablu Hordes (Route 115 — 100%) give 1 Special Defense EV per Swablu.
Speed
- Zigzagoon Hordes (Route 104 — 95%, but really 100%) give 1 Speed EV per Zigzagoon. The southern part of Route 103 also has a 5% chance of a Wingull Horde while the northern part of Route 103 has a 5% chance of a Taillow Horde. Both of these Pokémon also give 1 Speed EV each, ensuring 100% of encounters give 1 Speed EV per Pokémon.
- Zubat Hordes (Meteor Falls — 100%, Scorched Slab — 100%, Seafloor Cavern — 100%, Cave of Origin — 100%) give 1 Speed EV per Zubat. There are also other locations that are not 100% encounters.
How Many EVs You’ll Actually Gain
It’s important to keep in mind that all of the numbers listed above for how many EVs each Pokémon give are their base yield, so that’s before any multipliers or bonuses. The actual number you’ll get should be much higher than that.
Here’s a little cheatsheet for how much EVs you’ll gain (the base EV yield is the number you see listed in the encounters):
- If you have no Macho Brace, Power Item, or Pokérus…
- If the Pokémon’s base EV yield is 1, you’ll get 1 EV each, or 5 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 2, you’ll get 2 EVs each, or 10 EVs per Horde Battle. (There are very few 2 EV Horde Battles, and they are much rarer encounters and not recommended, so don’t count on this.)
- If the Pokémon’s base EV yield is 3, you’ll get 3 EVs each. (There are no Horde Battles for 3 EV Pokémon — only Trainers will have these.)
- If you have the Macho Brace but no Pokérus or the Pokérus but no Macho Brace…
- If the Pokémon’s base EV yield is 1, you’ll get 2 EVs each, or 10 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 2, you’ll get 4 EVs each, or 20 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 3, you’ll get 6 EVs each.
- If you have the Macho Brace and the Pokérus…
- If the Pokémon’s base EV yield is 1, you’ll get 4 EVs each, or 20 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 2, you’ll get 8 EVs each, or 40 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 3, you’ll get 12 EVs each.
- If you have a Power Item but no Pokérus…
- If the Pokémon’s base EV yield is 1, you’ll get 5 EVs each, or 25 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 2, you’ll get 6 EVs each, or 30 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 3, you’ll get 7 EVs each.
- If you have a Power Item and the Pokérus…
- If the Pokémon’s base EV yield is 1, you’ll get 10 EVs each, or 50 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 2, you’ll get 12 EVs each, or 60 EVs per Horde Battle.
- If the Pokémon’s base EV yield is 3, you’ll get 14 EVs each.