What the bug?

[Slurray]

Slurray switched in Dragonite (lvl 100 Dragonite ).
Pointed stones dug into Dragonite.
Dragonite lost 25% of its health.
Breloom used Substitute.
Breloom lost 25% of its health.
Breloom made a substitute!
Dragonite used Dragon Dance.
Dragonite's attack was raised.
Dragonite's speed was raised.
Dragonite's leftovers restored its health a little!
Dragonite restored 6% of its health.
Breloom's Poison Heal restored health!
Breloom restored 12% of its health.

Breloom is tightening its focus!
Dragonite used Dragon Dance.
Dragonite's attack was raised.
Dragonite's speed was raised.
Breloom used Focus Punch.
It's not very effective...
Dragonite lost 34% of its health.
Dragonite's leftovers restored its health a little!
Dragonite restored 6% of its health.
Breloom's Poison Heal restored health!
Breloom restored 12% of its health.

Breloom is tightening its focus!
Dragonite used Roost.
Dragonite restored 47% of its health.
Breloom used Focus Punch.
Dragonite lost 77% of its health.
Dragonite's leftovers restored its health a little!
Dragonite restored 6% of its health.
Breloom's Poison Heal restored health!
Breloom restored 0% of its health.

Breloom is tightening its focus!
Dragonite used Roost.
Dragonite restored 50% of its health.
Breloom used Focus Punch.
A critical hit!
Dragonite lost 80% of its health.
Slurray's Dragonite fainted.
Breloom's Poison Heal restored health!

---------------------------------------

Seriously, what the ****? How did his Focus Punch suddenly go from "It's not very effective" to normal damage?

 

[tawp64]

When you use roost, the flying typing is nullified. Therefore that turn, it was mono dragon type

 

[Slurray]

I forgot all about that >_< Thanks for clearing that up, I feel like a dumbass.