Mega Cat EX is similar to Mega Cat in terms of stats, but Mega Cat EX is a lot more effective in the battleground. They have the same attack animation length, speed, knockbacks and attack power, but EX has a shorter delay between attacks, more health, longer range and (in consequense) higher DPS.
It supports Black, Angel and Red enemies in the stages it appears in, purely rush units, you have to prevent its advance at all costs, which will be more difficult due to its overall stats improvement.
Encounters
This enemy has always appeared at 100% strength magnification.