SwtieBelle Lvl 10
SwtieBelle Lvl 11
Scootaloo Lvl 12
AppleBloom Lvl 14
If you want things easy catch Y Zecora and level her up to level 7 so she learns Confusion, which is super effective against all the Ponymon Brock is using (at least in 0.2, in which they are all Light type). Even without Zecora, level up a little bit before entering and it shouldn't give you too much trouble.
TM 39 Rock Tomb for defeating Brock.
- Brock makes a bad skyrim reference when you first talk to him to initiate the battle.
- When first talking to Brock to initiate the Gym battle he mentions that he has three ponies. However, upon fighting Brock he only has two ponies.