Thoughts/ideas regarding Deoxys-Normal and Deoxys-Attack:
Add Tera Dark on both of their current sets: Being immune to Prankster (especially prankster twave) is nice. Boosted damage on Knock Off is nice when it's already a safe move option. Resisting stray Sucker Punches is also nice to get one more hit in with mons that usually OHKO/2HKO everything.
Add a Setup Sweeper set: Nasty Plot / Psycho Boost / coverage / coverage. Coverage could be Thunderbolt/Shadow Ball/Ice Beam/Superpower/Knock off with Tera Psychic, Ghost, or Fighting. Always Life Orb.
Add Tera Dark on both of their current sets: Being immune to Prankster (especially prankster twave) is nice. Boosted damage on Knock Off is nice when it's already a safe move option. Resisting stray Sucker Punches is also nice to get one more hit in with mons that usually OHKO/2HKO everything.
Add a Setup Sweeper set: Nasty Plot / Psycho Boost / coverage / coverage. Coverage could be Thunderbolt/Shadow Ball/Ice Beam/Superpower/Knock off with Tera Psychic, Ghost, or Fighting. Always Life Orb.
- Nasty Plot, besides boosting Psycho Boost even further, allows Deo-N/A to click Psycho Boost again without having -2 SpAtk.
- Thunderbolt, Shadow Ball, and Ice Beam all hit various pokemon that can stomach Psycho Boost.
- Superpower hits most specially bulky pokemon. Knock Off is also an alternative - however, only one should be selected in order to avoid this set potentially only generating one special attack (Psycho Boost).
- Tera Psychic strengthens Psycho Boost. Tera Ghost boosts Shadow Ball and grants an immunity to Quick Attack and Extreme Speed. Tera Fighting strengthens Superpower and provides a resistance to Sucker Punch.
- I also would prefer to either have the physical coverage be forced or to only have Shadow Ball as special coverage. This prevents Deo-N/A from only having special moves.