Pokemon battle arena is better than Pokemon league.
to no you better
There is no Pokemon to catch in the Pokemon Battle Arena. But you can battle in the arena. Go into the buildings and go to the green man at a PC. Talk to the green an and he will let you battle.
your Pokemon aren't supposed to gain exp points in the battle arena
There is only rainbow ponytas' in Pokemon battle arena, you can get them and find the rarely on route 7.
battle trainners, and win
Corphish is a water type of Pokemon. In Pokemon Battle Arena, it will evolve if you manage to raise it to a level 30.
YOU CAN'T! (sorry)
it's not possible!
there is none.