Editing Pokémon (section)

=== Evolving ===
Some cards are evolutions of basic Pokémon. They can only be played on the corresponding basic Pokémon shown in the upper left corner. The attacks and powers of the basic Pokémon are lost and only the evolution counts from now on. All damage counters remain on the Pokémon but it is cured from any condition. You can't evolve a Pokémon the turn you played it or on your first turn. This also counts for evolutions (You can't evolve a just evolved Pokémon another step on the same turn). Evolutions can be played on any Pokémon on your field, even benched ones. You may also evolve as many Pokémon as you like in your turn as long as you don't violate the above rules. Evolved Pokémon do not have any restrictions! They can attack the same turn they evolved and you can even attack in your first turn. Evolutions normally can't access the moves and abilities of the basic Pokémon.

There's a bunch of different types of variant Pokémon that "evolve" from a Pokémon but are the same Pokémon just more powerful. There's no mechanical difference on these except for they are neither basic nor evolved Pokémon for effects that target one of those specifically. The one exception is Pokémon LV.X, which can use their previous form's moves.