Ok, so I finally got round to making the weapon forms of Hakades, Aoseidon and Kireus.
They take these forms when their ability 'to arms!' activates, when their HP hits 0. They equip themselves to the next pokemon to come out in solo battles, and in double and triple battles, it will equip itself to the partner that will be attacking next on the field.
Once equiped, that pokemon has all it's stats boosted by 2 stages.
in universe, the legendary weapons have been sleeping in this state after a war between the 3 rages several thousand years ago by the gods themselves. What's going to be happening to them in the modern day though will be revealed in due time~
Hakades becomes the legendary Spear, the pokemon weilding it will have one of it's moves replaced with 'Supreme Spear'
Aoseidon becomes the legendary Trident, the pokemon weilding it will have one of it's moves replaced with 'Terrific Trident'
and Kireus becomes the Legendary Bolt, the pokemon weilding it will have one of it's moves replaced with 'Brilliant Bolt'
The negative side effects of these moves (HP reducing to Zero after the attack) are not applied in weapon form.
Any pokemon can weild them. They can only wield one legendary weapon at a time though. The weapons will also grow/shrink to suit the pokemon they'll be equiped too.
If the pokemon they are equipped to is KO'd, they return to normal form in a fainted state in the party.
they also revert back into normal form in a fainted state at the end of the battle in the party.