Its effects are negated, also it cannot declare an attack this turn
The second attack is even more impressive, first, the player must remove all energy from the Pokmon then the player can choose two of the opponent's Pokmon and deal 120 damage to both of them.
0 Smokescreen : 10 During your opponents next turn, if the Defending Pokmon tries to attack, your opponent flips a coin
I played Unholy Heat over this literally yesterday (I had a lot of sorcery speed spells and wanted to up my instant count) and regretted it as I failed to be able to kill a 3 toughness dork on turn two in multiple games
This monster has the same piercing battle damage and immunity to spells/traps in the battle phase as Ancient Gear Golem, but now it has an impressive 4400 attack to wield alongside it
40 damage and discarding a Tool is nothing to shake a stick at, especially on a starter Pokemon that you will only attack with once or twice at most in a game before it becomes useless