When you invite people to battle you can select 'free battle' 'lv 50 battle' or 'lv 100 battle'. That's what you want. Although, I always select free battle, because I don't care if my opponent uses all level 100s or not.
OK, Btw we can do voice chat but my mic and speakers are messed up!
Ok, register me on your palpad, go downstairs in a pokemon center into the blue room.
Talk to the second lady from the escilater.
Do what she says, and wait for me.