This is Generadium (Generator + Radium), the Radioactive Pokémon. The text are tiny and you might miss a few things so here they are:
Dex entry: Lizathorium that have ingested too much radioactive matter will evolve into Generadium. It suffers from a melting body due to the intense energy generated by its RTG generator and the highly radioactive nature of its evolution. And yet, it continues feasting on radioactive matter, for it needs the energy from its generator to stay alive.
Base stats: 75 HP, 90 Attack, 105 Defense, 69 Sp.Attack, 91 Sp.Defense, 99 Speed, 529 BST
Signature Ability (RTG Generator): When poisoned or hit by a Poison-type attack, boosts the next Electric-type attack
Signature Move 1 (Radioactive Transmutation): Drastically raises Sp.Atk but badly poisons itself by converting decaying radioisotopes into electricity
Signature Move 2 (Nuclear Annihilation): Poison-type Explosion that can hit Steel-types, creates a Wasteland on the battlefield for 3 turns; wasteland causes all non-Poison-type Pokemon to be poisoned and all Pokemon to take 1/12 of max HP worth of damage every turn.
by _-eeeeeeeeeeeeeeee-_