I'm too lazy to find one more game demonstrating deo-s strength but here's a replay of it just breaking the opponents team for its teammate to win https://replay.pokemonshowdown.com/gen9uu-2359122899-ubf0uu0qik9qd1jecnvwsntfo2hgu9vpwControversial takes
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It can have many set variety and ev spread depending on what you need it for, as well being so fast it outspeeds the whole metagame with no speed(Excluding timid Baraskewda ). This allows you to invest it all into attacks which makes it have no real switch in and beats several top ranking mon. It also can threaten mons. It can also outspeed scarfer without having to hold a choice scarf, which only it and Ogerpon can do, and Ogerpon have to tera for it. It can even go into attack boosting natures to do this, such as outspeed +1 Excadrill and base 100 speed scarfers with attack boosting natures.
Some Calc with Psycho boost, superpower, knock off, and thunderbolt
2hko tornadus-t and ohko with tera electric
252+ SpA Life Orb Tera Electric Deoxys-Speed Thunderbolt vs. 56 HP / 0 SpD Tornadus-Therian: 369-437 (117.8 - 139.6%) -- guaranteed OHKO
252+ SpA Life Orb Tera Electric Deoxys-Speed Psycho Boost vs. 56 HP / 0 SpD Tornadus-Therian: 286-339 (91.3 - 108.3%) -- 50% chance to OHKO
Av torn dies to knock plus attacking move
252 Atk Life Orb Tera Electric Deoxys-Speed Knock Off (97.5 BP) vs. 252 HP / 0 Def Tornadus-Therian: 134-159 (37 - 43.9%) -- guaranteed 3HKO
252+ SpA Life Orb Deoxys-Speed Thunderbolt vs. 252 HP / 64 SpD Tornadus-Therian: 231-273 (63.8 - 75.4%) -- guaranteed 2HKO
Av torn dies to non-tera thunderbolt then tera thunderbolt
252+ SpA Life Orb Deoxys-Speed Thunderbolt vs. 252 HP / 64 SpD Assault Vest Tornadus-Therian: 153-182 (42.2 - 50.2%) -- 0.4% chance to 2HKO
252+ SpA Life Orb Tera Electric Deoxys-Speed Thunderbolt vs. 252 HP / 64 SpD Assault Vest Tornadus-Therian: 229-273 (63.2 - 75.4%) -- guaranteed 2HKO
Ohko even bulky Excadrill
252 Atk Life Orb Tera Electric Deoxys-Speed Superpower vs. 156 HP / 0 Def Excadrill: 413-489 (103.2 - 122.2%) -- guaranteed OHKO
2hko Bulky Heatran with Tera and rocks
252 Atk Life Orb Tera Electric Deoxys-Speed Superpower vs. 252 HP / 96+ Def Heatran: 218-257 (56.4 - 66.5%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Life Orb Tera Electric Deoxys-Speed Thunderbolt vs. 252 HP / 0 SpD Heatran: 161-191 (41.7 - 49.4%) -- guaranteed 3HKO after Leftovers recovery
2hko offensive heatran
252 Atk Life Orb Deoxys-Speed Superpower vs. 0 HP / 0 Def Heatran: 263-309 (81.4 - 95.6%) -- guaranteed 2HKO
2hko hydrapple
252+ SpA Life Orb Deoxys-Speed Psycho Boost over 2 turns vs. 252 HP / 0 SpD Hydrapple: 474-561 (113.9 - 134.8%) -- guaranteed KO in 2 turns
Ohko Specs hydrapple with rocks
252+ SpA Life Orb Deoxys-Speed Psycho Boost vs. 0 HP / 0 SpD Hydrapple: 317-374 (89.8 - 105.9%) -- guaranteed OHKO after Stealth Rock
2hko zaruade
20 Atk Life Orb Deoxys-Speed Superpower over 2 turns vs. 0 HP / 4 Def Zarude: 351-416 (100 - 118.5%) -- guaranteed KO in 2 turns after Leftovers recovery
Ohko Cobalion
252+ SpA Life Orb Deoxys-Speed Psycho Boost vs. 0 HP / 4 SpD Cobalion: 341-403 (105.5 - 124.7%) -- guaranteed OHKO
Ohko Lokix with tera (Most of the time)
252+ SpA Life Orb Tera Electric Deoxys-Speed Thunderbolt vs. 0 HP / 4 SpD Lokix: 273-321 (96.4 - 113.4%) -- 75% chance to OHKO, taking in account crit and para then full para chance, it have a higher odd than hitting hydro pump
2hko rotom
252+ SpA Life Orb Deoxys-Speed Psycho Boost over 2 turns vs. 252 HP / 0 SpD Rotom-Wash: 375-442 (123.3 - 145.3%) -- guaranteed KO in 2 turns after Leftovers recovery tera stellar is a guranteed ohko or 50% chance with rocks
2hko Skeledirdge
252+ SpA Life Orb Deoxys-Speed Psycho Boost over 2 turns vs. 252 HP / 164 SpD Unaware Skeledirge: 548-648 (133 - 157.2%) -- guaranteed KO in 2 turns
2hko slowking
252 Atk Life Orb Deoxys-Speed Knock Off (97.5 BP) vs. 252 HP / 252+ Def Slowking: 185-218 (46.9 - 55.3%) -- 68.8% chance to 2HKO
252+ SpA Life Orb Deoxys-Speed Thunderbolt vs. 252 HP / 4 SpD Slowking: 208-247 (52.7 - 62.6%) -- guaranteed 2HKO
Ohko Thundurus-T
252+ SpA Life Orb Deoxys-Speed Psycho Boost vs. 0 HP / 0 SpD Thundurus-Therian: 317-374 (106 - 125%) -- guaranteed OHKO
Ohko Tyranitar
12 Atk Life Orb Deoxys-Speed Superpower vs. 252 HP / 0 Def Tyranitar: 406-478 (100.4 - 118.3%) -- guaranteed OHKO
Ohko Latios after rocks
252 Atk Life Orb Deoxys-Speed Knock Off (97.5 BP) vs. 0 HP / 4 Def Latios: 265-315 (88 - 104.6%) -- guaranteed OHKO after Stealth Rock
Also 0 speed evs works, and I have had games in the top 100 where deo-s just won me the game essentially