what is the strongest mover ener used

explosion is the move

That is easy. The strongest mover ever used has to be GIGA IMPACT. Although you have to recharge after use.

Judgement, the signature mover of Arceus.

1-HIT KO MOVES

Fissure,
PP:5(8 max)
POWER:1-HIT KO
ACCURACY:30
TM27
GUILLOTINE,
PP:5(8 max)
POWER:1-HIT KO
ACCURACY:30
NOT A TM,HM,OR mover TUTOR MOVE

HORN DRILL,
PP:5(8 max)
POWER:1-HIT KO
ACCURACY:30
TM07

link

that's an easy one. the strongest ever used would be explosion. it does 250 damage.

flare blitz or frenzy plant
tires them out
but powerful