Vapoureon Undevelop

[collectioncollector]

Hi, with RR vapoureon's undevelop power could you undevelop and then evolve eevee back into vapouroeon in the same turn?

Also when you devolve with undevelop does the eevee underneath still keep all the energy cards and poke tools that were on vapoureon?

Thanks

[PokePop]

Not normally, no.

Yes, all those, and damage counters too!
Note, though, that if something has a requirement that it can only be attached to an evolved Pokemon, when it devolves to a Basic, that thing would have to be discarded.