FYI,here`s the official ruling.
`Sensei
Q. Can I play a Boost Energy on an "Evolved" Basic Pokemon (such as a
Wobbuffet that has evolved from Wynaut)?
A. Yes, you can. It states on Boost Energy you can only play it on
Evolved Pokemon and Wobuffet is considered an "Evolved" Pokemon in this
case. (Oct 16, 2003 PUI Rules Team)