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migrate the Pokemon from past game boy advanced games like emerald, firered, leafgreen, sapphire and ruby.
must obtain the required number of league badges
skill
You have to beat the league.
Get 8 badges
Ghost, Fire, Ground, Psychic, and Ice
Go to sunyshore city, then go up in the water (make sure you got surf and waterfall) to swim and to go up the waterfall to The Pokemon League then you will reach a Pokemon league cave past it and then go to the Pokemon league heal your Pokemon and fight
In Pokemon platinum you must find all the Pokemon in your game to be aloud past so it should be the same in your game
route 2 in the island you open after getting past the Pokemon league
You can use any Pokemon. As far as I know you don't have to use certain Pokemon to challange them.
In the Pokemon League in Yellow, the strongest Pokemon Lance has is a Dragonite. When you get past him, still there's Gary that finished the league before you do. His stongest Pokemon is Jolteon, an evolve of Eevee. It is level 64 and it is really strong.
youhave to have beaten the Pokemon league.