Hi. My nickname is Myrmidon and i send you this beacause i have a
japnese card that i don't know what it is.  It's a Mewtwo that is lv. 30
with 60 HP.  He's symbol is a pokéball.  His first attack costs 1 Psy.
Energy and his second 3 Psy. Energy.  He's weakness is Psychic and his
retreat cost is two.  There are no damage numbers next to his attacks.
It's a rare card, not holographic. What Mewtwo is it?  The picture is a
small near-invinsible Mewtwo that getting taller.  He has in a hand a
sort of energy ball.  The background is black and red.

What you have is the Nintendo Power Promo Mewtwo.  It was released in the April 2000 issue of Nintendo Power.  Actually, this is the English equivalent - promo #12.

The Japanese version of this card was released with the 10 card Japanese CD containing a Charizard, Blastoise, Venusaur, and more.

Scott