If you have a card in your hand that says Evolves from so-and-so and so-and-so is the name of a Pokmon you had in play at the start of your turn, you may play that card in your hand on top of Pokmon so-and-so
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Now, while this isn't the strongest ex card by a long shot, it does provide a Grass-type alternative until you pull a Venusaur ex
It is a Lightning card illustrated by AKIRA EGAWA
(2) If this card in the Monster Zone is destroyed by battle or card effect: You can add it to your hand, then, if it was destroyed by your opponent, you can Special Summon it
Mew ex has two moves the humble 20-damage Psyshot which costs one Psychic-type energy, but another, far more threatening attack called Genome Hacking, which costs three of any type of energy, and allows you to choose any of the attacks from your opponent's active Pokemon to use yourself, seemingly with no consequences