Where's the best places to EV train in Ruby/Sapphire?

Question

All stats, please
by best, consider encounter rates and the ev yield of the Pokemon in the area. like a 100% spawn rate, or multiple Pokemon encounterable giving the same EVs, or even multiple evs.

Answer 1

Fortunately for EV trainers, Marriland has a great guide to EV training in each game. Here is what I took from it, specifically on Ruby and Sapphire:

Here is where to EV train for each stat.

• HP: In Rusturf tunnel, Whismur is a 100% encounter and gives 1 HP EV.
• ATK: On Routes 102, 117 and in Petalburg city Corphish is a 100% encounter with the super rod, and gives 1 ATK EV.
• DEF: Underwater on Routes 124 and 126 Clamperl is a 65% encounter and gives 1 DEF EV.
• SPA: On Route 112, Numel is a 75% encounter and give 1 SPA EV.
• SPD: In the Abandoned Ship, Tentacool is a 99% encounter and gives 1 SPD EV. The other 1% encounter is Tentacruel, which gives 2 SPD EVs.
• SPE: Surfing on Route 104 has a 95% chance to yield a Wingull, which gives 1 SPE EV.

Source: Marriland's amazing guide, and EV training my entire team in Emerald.

Remember to use a Macho Brace (From the Winstrate Family) and catch Pokerus. Happy EV training! Hope I helped.

Comments

do you by chance know of an alternative for attack? Wondering as i do not have a superrod at this stage in the game.

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If you have no Super Rod, there are a few more options as well. If you're playing Ruby, Route 114 has a good chance to give Zangoose or Nuzleaf, which give 2 ATK each. If you're playing Sapphire, floors 1, 2, and 3 of Mt. Pyre have a 100% chance to give Shuppet, which gives 1 ATK EV.

Answer 2

HP locations
Walking at Rusturf Tunnel: Whismur (1 EV)
Surfing at just about any freshwater pond: Marill (2 EVs)
Super rod at Dewford Town or Slateport City: Wailmer (1 EV)
Super rod at Meteor Falls any room that requires waterfall: Barboach (1 EV), Whiscash (2 EVs)
Super rod at Victory Road: Barboach (1 EV), Whiscash (2 EVs)

Physical attack locations
Walking at Mt. Pyre 1F-3F: Shuppet (1 EV) (doesn't work in Ruby)
Super Rod at Petalburg City: Corphish (1 EV)
Super Rod at Route 118: Carvanha (1 EV), Sharpedo (2 EVs)

Special defense locations
Surfing or super rod at Abandoned Ship: Tentacool (1 EV), Tentacruel (2 EVs)

Speed locations
Any rod at Route 104: Magikarp (1 EV)
Walking at Seafloor Cavern: Zubat (1 EV), Golbat (2 EVs)
Surfing at Victory Road: Golbat (2 EVs)
source: Bulbapedia location pages

Comments

What about Defense and Special Attack? The question asked for all stats.

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Your answer already covered them and I don't know of any better locations.