Q. My opponent has Cradily ex in play. Can I use a Trainer card, or an
attack on a Pokémon to evolve my Active Pokémon?
A. You could not use an Pokémon’s attack or play a Trainer card to
evolve your Active Pokémon, unless the Evolution card you would be putting
into play, comes from somewhere other than your hand. [So Rare Candy
cannot be used, but Wally's Training can.] (Team Magma vs Team Aqua
Prerelease FAQ, Q9; Mar 4, 2004 PUI Rules Team)