The thing is, it bites hard on both sides. Even if you send in a Fire-type Pokemon to tank the explosion, it may still very well KO. Since team preview is on, the opponent can read that you're going to switch to a Flash Fire Pokemon like Heatran and punish accordingly.
I've changed it so it hits through Substitute as well.
Derision
Type: Dark
Category: Status
Power: --
Accuracy: --
PP: 20
Descriptions:
The user mocks the target, sending them into a furious tantrum. Targets under the effect of Derision gets 1.3x boost to their moves, but is locked to one move, akin to the side effects of Outrage. Once Derision ends, the affected target becomes confused.
While being locked into a move, the Pokemon cannot switch out.
Learned by: Any Pokemon that can learn Taunt can learn Derision.
Evil Surge
Type: Dark
Category: Special
Power: 60
Accuracy: 100
PP: 5
Descriptions:
The user lets out a vicious storm of energy, depleting one of the target's moves' PP completely. All of the user's stats fall by 1 stage after use.
Learned by: Any Pokemon that can learn Dark Pulse can learn Evil Surge.
Disorient
Type: Dark
Category: Status
Power: --
Accuracy: --
PP: 10
Descriptions:
The user distracts the target, interfering with their concentration. The target's Accuracy, Evasion and Special Attack drops by 1 stage. If the target has used Calm Mind, their Special Attack and Special Defense drop by 3 extra stages as well. If the target has used Meditate, their Attack drops by 3 extra stages as well. If the target's in the charging phase of Focus Punch, the target won't be able to pull off the move and will also be confused.
Learned by: Any Pokemon that can learn Snarl can learn Disorient.
Exploit
Type: Dark
Category: Physical (Damage is calculated using the target's weaker defense)
Power: 80
Accuracy: --
PP: 10
Descriptions:
The user strikes the weak point of the target with a harsh blow. If any of the target's stats are lowered, this move will guarantee a Critical Hit.
Damage is calculated using the target's weaker defense.
Learned by: Any Pokemon that learns Night Slash can learn Exploit.
Poltergeist
Type: Ghost (Typing depends on active hazards/screens)
Category: Physical
Power: 50 (Multi-Hit)
Accuracy: 100
PP: 15
Descriptions:
The user sucks up all active hazards and screens, then fires them at the opponent. Typing depends on sucked objects.
Spikes: Ground (Hits Flying-type Pokemon and Pokemon with Levitate!)
Stealth Rocks: Rock
Toxic Spikes: Poison (Inflicts Toxic on the target)
Sticky Web: Bug (Lowers target's Speed by 2 stages)
Light Screen/Reflect: Psychic
The objects are fired in the order of "Spikes -> Stealth Rocks -> Toxic Spikes -> Sticky Web -> Light Screen -> Reflect". Tallying up to a maximum of 9 hits.
Learned by: Gengar, Cradily, Swalot, Dusclops, Dusknoir, Cofagrigus, Hoopa