You are not able to change the lineup in battle arena (battle frontier). What they play is partially strategy as well as you are advised to have tactics in lining. For instance like me, I use Swampert (ground and water) followed by Swellow (not a good flying but can help against Swampert's weakness) and then a Magneton (an extra just in case...).
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battle trainners, and win
In Pokemon Battle Arena, Pokemon only compete in battles and contests. However, they do not gain EXP or level up.
level50
Youelcum!Hmhmhmhmhmhmhm...
You need the Pokemon with arena trap in battle or the wild Pokemon can flee