Deoxys-Speed @ Focus Sash
Trait: Pressure
EVs: 252 Atk / 4 SDef / 252 Spd
Jolly Nature
- Stealth Rock
- Fire Punch
- Spikes
- Taunt
Not much to explain here. You know what Deoxys-S does. You can usually start the match with two layers of hazards. Fire Punch to OHKO Genesect, 2hko Forretress, Ferrothorn and Excadrill.
Having Genesect removed from the match on turn 1 will mean that our opponent will be forced to use faster Pokemon to revenge kill Latios. The faster Pokemon include: Mewtwo, Deoxys-A(without Ice Punch), Darkrai, Arceus-Ghost and -Bug. The first three fail to KO Latios at full health while the latter can only KO Latios if it is using the Swords Dance set.
Some interesting benifits this adds to the team:
252 Atk Deoxys-S Fire Punch vs. 252 HP / 0 Def Ferrothorn: 212-252 (60.22 - 71.59%)
+
252 SpA Soul Dew Latios Hidden Power Fire vs. 252 HP / 208+ SpD Ferrothorn in rain: 152-180 (43.18 - 51.13%) -- 5.08% chance to 2HKO after Stealth Rock
=
Dead Ferrothorn
OR
252 SpA Soul Dew Latios Hidden Power Fire vs. 252 HP / 208+ SpD Ferrothorn in rain: 152-180 (43.18 - 51.13%) -- 98.44% chance to 2HKO after Stealth Rock and Spikes.
=
Dead Ferrothorn.