Completing a streak of 10 battles in Super mode for Single, Double, or Multi will earn you the right to face off with a Battle Legend, a major character from previous games or from this game. They're much more difficult to defeat and some may use Mega Evolution!
You get more BP for defeating them, however, and you'll earn the ability to Scout for them in Multi Battles if you can defeat them.
|Red||Venusaur, Blastoise, Charizard, Lapras, Snorlax|
|Blue||Pidgeot, Arcanine, Alakazam, Machamp, Exeggutor, Gyarados, Aerodactyl, Tyranitar, Rhyperior|
|Anabel||Alakazam, Snorlax, Raikou, Entei, Latios, Lucario|
|Wally||Altaria, Garchomp, Magnezone, Gallade|
|Cynthia||Milotic, Spiritomb, Garchomp, Lucario, Togekiss|
|Grimsley||Houndoom, Tyranitar, Sharpedo, Absol, Honchkrow, Drapion, Liepard, Scrafty, Bisharp|
|Colress||Muk (Alolan), Electrode, Porygon2, Metagross, Magnezone, Porygon-Z, Klinklang|
|Sina||Sandslash (Alolan), Abomasnow, Glaceon, Lilligant, Mandibuzz, Oranguru, Drampa|
|Dexio||Ninetales (Alolan), Slowbro, Espeon, Whimsicott, Braviary, Passimian, Turtonator|
|Kiawe||Arcanine, Marowak (Alolan), Kangaskhan, Talonflame, Salazzle|
|Mallow||Sceptile, Talonflame, Trevenant, Toucannon, Lurantis, Tsareena, Comfey|
|Guzma||Pinsir, Honchkrow, Toxicroak, Liepard, Bisharp, Toxapex, Golisopod|
|Plumeria||Gengar, Crobat, Toxapex, Lurantis, Salazzle|
Not Our Rules!
It might feel like a player punch to the gut, but many of the Pokemon and items used by the Battle Legends are impossible for you to get as of right now. Most notably, items such as the Pidgeotite and Altarianite are impossible to obtain for now.
Also, before the Pokemon Bank update, you won't be able to bring over your own Entei or anything either. Sorry not sorry...?