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I really like the "Cubone being a baby Kangaskhan" thing,even though the types don't match up.
Also, I totally think that baby Kangaskhan should be its own species, and there should be some significance to Slowbro/Slowking having Shellder attached to them. Maybe have a Shellder fuse with them to evolve, like the way Kyurem fuses with Reshiram/Zekrom, and have an ability related to their being two Pokemon together.