Deoxys-Speed is definetly an amazing pokemon, from its lead set, to trick scarf, to boots 4a, life orb. I've mainly seen it as a speed control on BO and more balanced teams where it knocks off and revenge kills pokemon. Its Nasty Plot life orb set is also nice on HO especially PsyTerrain, however its still a deoxys-speed so its damage is very middling, and against bulkier teams or even offensive pokemon like rillaboom, gholdengo and walking wake. Since it struggles againts arguably the best style at the moment, Balance i wouldn't say its at all OP, even as a lead, other stuff that i thought would get phased out by it like glimmora, great tusk or ribombee are still excellent.
Uhhh yeah, this pokemon is not THAT good. Its still a great threat, one of the best scarfers, but the fact that it can easily be argued to be the 6th or 7th best dark type in ou (Kingambit (king of ou), Meowscarada (triple axel made it OP), Weavile (same as meow), Ting-Lu (spikes are broken, it also matches up vs new mons), Samurott-Hisui (spikes + knock broken), Roaring-Moon (HO Staple)) is kinda sad. However its still good and i doubt it will drop to UU, but its not getting banned.
great on HO as a sidegrade to iron-valiant where its the main speed control, it has amazing speed but somewhat middling attack. It's quite balanced since realistically you will never sweep with it againt a bulkier team. One thing about SV pokemon that i love but also find weird is how its physical attackers have really high special defense but its special attackers have high defense.
Oh yea this mon is really good. The addition of triple axel turned this mon from good to amazing, tons of balance team get carried by this pokemon's ability to knock off items and threaten gliscor and roaring moon. seriously you need to try this pokemon now.