I'm glad you asked
We have the:
Aqua Cassette アクアカセット
Lighting Cassette イナズマカセット
Blaze Cassette ブレイズカセット
Freeze Cassette フリーズカセット
光弾を 相手に 放出する。\ufffe自分の 持つ\ufffeカセットにより タイプが 変わる。
It releases a photon lazer/flare bomb (can't find a great translation but think light and bullet/bomb) at the opponent. Its type changes according to the cassette being held.
Can't find details of the attack, but will keep searching
There's also an attack called Ancient/Antique Song that I think might be Meloetta's. Has a chance of putting opponents to sleep.
Checking against his learnset, he gets three new moves:
[M546], [M488], and [M493]
[M546]: Special Normal PP: 5 Power: 85 / Accuracy: 100 Effect: If user is holding a Plate, this attack's type depends on the Plate held.
[M488]: Physical Fire PP: 20 Power: 50 / Accuracy: 100 Effect: [E127]
[M493]: Other Normal PP: 15 Power: --- / Accuracy: 100 Effect: [E12A]
Due to being the only one to know the move and being normal type (the general neutral type for these kind of things), and that Arceus does not get the move, 546 is most likely the attack itself, and plate is just assumed by the person who translated it.
Pretty lame move if you ask me, since it can learn Flamethrower, Thunder Bolt & Ice Beam, while Tri Attack has more only 5 less Base Power but 5 more PP
If you scroll down to Jaroda’s stats, it lists his Base stats differently than Serebii or Pokebeach. He has a nice 113 in Sp.Attack. It’s most likely a simple typo, BUT NONETHELESS this throws out at least a mere glimmer of hope in the universe that my lil’ smug grass snake won’t be incredibly terrible after all.
It's a mistake, let the hope die. You see, the game's coding lists Speed in the middle, rather then last. But every fansite ever lists it last.