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Easiest way would be to play LC then you have tons of options.
Also cuteness is kind of a personal taste thing :/
Anywho:
- Belly Drum Furret is pretty cool
- Clefable is a great tank if you dont feel like working with blissey
- Togekiss is a classic as well
- Dragonite
- Mew
- Jumpluff
- Gorebyss I guess if you find it cute :/
- Ninetails (more pretty but meh)
- Celebi
- Jirachi
- Politoed, even though he is now the spawn of satan.
- Keldeo
- Pretty much all the eevees
- Lanturn
- Cinccino
- Miltank
and many many more, all depends on what you want to do exactly and what you personally fine cute.