Why not use Sparkle Motion Celebi? Seems like a reasonable excuse to use him against grass types.I've been trying to make Boundaries Cross Raticate work. Adding the Crobat/Golbat Line doesn't seem like a good strategy, It's important to OHKO the opponent's Pokémon. You need to keep pressure, or else your Raticate won't last very long in the active spot. Though a Bat Line could be nice as a back up against Grass Pokémon. Instead I would play two Natu from Roaring skies to keep the price trade even. And to save room for other cards in my deck.
To be honest I don't think this Raticate Break will be better than Its predecessor. You could combine Boundaries Crossed Raticate with Mew EX and Dimension Valley to reduce Energy costs and have slightly more HP. It's new ability doesn't seem crucial to me either. Being poisoned doesn't matter all that much when you keep knocking out your opponent's active Pokémon.
Now, I do hope there will be support for Stage or Break Pokémon. Having to set-up a new stage 2 Pokémon every time your low HP Raticate Break is knocked-out is jut not good enough.