All EVs mentioned are without Macho Brace.
It is recommended that you have full access in all regions.
Best spot for EVs:
HP:5x Marill (10EVs), Route 114, Surf, Hoenn,100% HP EV Encounter
Atk:5 x Rhydon (10 EVs), Victory Road, Sinnoh 100% Atk EV Encounter
Def:5 x Pelipper (10 EVs), Surf, Undella Bay, Unova, 100% Def EV Encounter
Sp Atk:5 x Golduck (10EVs), Cape Brink, Surf, Two Island, Kanto, 100% Sp Atk EV Encounter
Sp Def: 5 x Tentacruel (10 EVs), Surf, SevenIsland, Kanto, 100% Sp Def EV Encounter
Speed: 5 x Rapidash (10 EVs), Grass, Route 12, Unova, 100% Speed EV Encounter
Highest Exp. spot for Leveling:
5 x Golduck, Surf, Cerulean Cave, Kanto, 6k Exp.per horde
5 x Poliwhirl, Surf, Mt. Silver, Johto,6k Exp.per horde
5 x Tentacruel, Surf, Battle Frontier, Hoenn, 6k Exp. per horde
5 x Camerupt, Grass, Stark Mountain, Sinnoh, 6k Exp. per horde
5 x Piloswine, Dark Grass, Giant Chasm, Other Side of Cave, Unova, 6k Exp. per horde
Alternative spot for EVs:
HP: 5 x Dunsparce (5EVs), Three Isle Port, Grass, Three Island, Kanto,100% HP EV Encounter
HP:5 x Wobbuffet (10 EVs), 5 x Lickitung (10 EVs), Cerulean Cave Entrance, Kanto, 100% HPEV Encounter
HP:5 xLickitung (10 EVs), Grass, Route 44, Johto, 100% HPEV Encounter
HP:5x Loudred(10EVs), Desert Underpass,Hoenn,100% HP EV Encounter
HP:5 x Hariyama (10 EVs), Victory Road, Hoenn, 100% HPEV Encounter
HP:5x Sealeo (10 EVs), Surf, Route 230, Sinnoh, 100% HP EV Encounter
HP: 5 x Stunfisk (10 EVs), Icirrus City, Surf in Pond, Unova,100% HP EV Encounter
HP: 5 x Amoonguss (10 EVs), Dark Grass, Route 10, Unova,100% HP EV Encounter
Atk:3 x Paras (3EVs), Mt. Moon, Cave, B1F, Kanto, 100% Atk EV Encounter
Atk: 5 x Nidorino (10EVs), Grass, Route 15, Kanto, 100% Atk EV Encounter
Atk: 5 x Primeape(10EVs), 5 x Arbok(10EVs), Grass, Route 23, Kanto, 100% Atk EV Encounter
Atk: 5 x Kingler (10 EVs), 5 x Machoke (10 EVs), Cave, Cliff Cave, Johto, 100% Atk EV Encounter
Atk: 5 x Ariados (10 EVs), 5 x Banette (10 EVs), Sky Pillar, Cave, Hoenn, 100% Atk EV Encounter
Atk:5 x Bouffalant (10 EVs), Grass, Route 10, Unova, 100% Atk EV Encounter
Atk:5 x Tranquill (10EVs), Dark Grass, Route 12, Unova, 100% Atk EV Encounter
Atk:5 x Bibarel (10 EVs), Grass, Sendoff Spring, Sinnoh, 100% Atk EV Encounter
Atk:5 x Machoke (10EVs), Grass, Route 211, Sinnoh, 100% Atk EV Encounter
Def:5 x Sandslash (10EVs), 5 x Marowak(10 EVs), Victory Road, Kanto, 100% DefEV Encounter
Def:5 x Tangela (5EVs), Route 21, Grass, Kanto,100% DefEV Encounter
Def:5x Slowbro (10 EVs), Cape Brink, Grass, Two Island, Kanto, 100% Def EV Encounter
Def:5 x Metapod (10 EVs), Kakuna (10EVs), Pattern Bush, Grass, Six Island, Kanto, 100% DefEV Encounter
Def:5 x Sandslash (10EVs), Route 26, Grass, Johto,100% DefEV Encounter
Def:5 x Pelipper (10 EVs), Surf, Ever Grande City Entrance, Hoenn, 100% Def EV Encounter
Def:5 x Pelipper (10 EVs), Surf, Route 222, Sinnoh, 100% Def EV Encounter
Sp Atk: 5 x Flaaffy (10 EVs), 5 x Girafarig (10 EVs), Grass, Route 43, Johto,100% Sp Atk EV Encounter
Sp Atk: 5 x Gloom (10EVs), Grass, Route 119, Hoenn, 100% Sp Atk EV Encounter
Sp Atk: 5 x Golduck (10EVs), Surf, Resort Area, Sinnoh, 100% Sp Atk EV Encounter
Sp Atk: 5 x Duosion (10 EVs), Grass, Route 9, Unova, 100% Sp Atk EV Encounter
Sp Atk: 5 x Heatmor (10 EVs), Victory Road, Outside Grass, Unova, 100% Sp Atk EV Encounter
Sp Atk: 5 x Litwick (5EVs), Celestial Tower, Unova, 100% Sp Atk EV Encounter
Sp Atk: 5 x Golduck (10EVs), Grass, Route 11, Unova, 100% Sp Atk EV Encounter
Sp Def: 5 x Dewgong(10 EVs), Icefall Cave,Four Island, Kanto, 100% Sp Def EV Encounter
Sp Def: 5 x Tentacruel (10 EVs), Surf, Route 26, Johto, 100% Sp Def EV Encounter
Sp Def: 5 x Tentacruel (10 EVs), Surf, Battle Frontier, Hoenn, 100% Sp Def EV Encounter
Sp Def: 5 x Tentacruel (10 EVs), Surf, Victory Road, Sinnoh, 100% Sp Def EV Encounter
Sp Def: 5 x Gothorita(10 EVs), Dark Grass, Route 9, Unova, 100% Sp DefEV Encounter
Sp Def: 5 x Mantine (10 EVs), Surf, Undella Town, Unova, 100% Sp Def EV Encounter
Speed: 5 x Pigeotto (10 EVs), Grass, Five Isle Meadow, Kanto, 100% SpeedEV Encounter
Speed: 5 x Poliwhirl (10 EVs), Surf, Blackthorn City, Johto,100% SpeedEV Encounter
Speed: 5 x Poliwhirl (10 EVs), Surf, Mt. Silver, Johto,100% SpeedEV Encounter
Speed: 5 x Linoone(10 EVs), Grass, Route 121, Hoenn, 100% SpeedEV Encounter
Speed: 5 x Raticate(10EVs), Dreamyard Basement, Unova, 100% SpeedEV Encounter
Speed: 5 x Basculin (10 EVs),5 x Buizel (5 EVs), Surf, Route 11, Unova, 100% Speed EV Encounter
Speed: 5 x Liepard (10 EVs), Dreamyard, Dark Grass, Unova, 100% Speed EV Encounter
Speed:5 x Floatzel (10 EVs), 5 x Electabuzz (10 EVs), Grass, Route 222, Sinnoh, 100% SpeedEV Encounter
Carry Leppa Berries if you want.
EV Reduction berries:
HP:Pomeg Berry (-10 HP EVs)
Atk:Kelpsy Berry (-10 Atk EVs)
Def:Qualot Berry (-10 Def EVs)
Sp Atk:Hondew Berry (-10 Sp Atk EVs)
Sp Def:Grepa Berry (-10 Sp Def EVs)
Speed:Tamato Berry (-10 Speed EVs)
All the best.
Edited by Akshit