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And its attack is one of those cheeky ways to target benched Pokemon, so that's neat

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Kaito has a passive ability that lets you add loyalty counters to him anytime a creature you control deals combat damage to another player, letting you hit that -9 final ability faster

I would probably keep Mew EX on the bench, and move it into the active Pokemon spot to either use one of your Pokemon's great moves right away, or more than likely to use Replace for a turn, move many of your energy cards in play to one Pokemon and then retreat Mew EX the next turn and put in that Pokemon you just moved all the energy cards to, that way you can attack immediately with that Pokemon, regardless if it requires 4 or 5 energy cards and you didn't have any energy cards attached to it the previous turn