This is something I did with a friend, a year ago... pretty cool, in my opinion. We wanted to see how much damage it was possible to theoretically deal to a Pokemon, so we used Shoddy Battle, since it shows percentage. There might be a better way out there, but that is the best one we could have thought of, at the time.
Rules: OHKO Clause, Sleep Clause, Species Clause
Alphacme sent out Porygonz (lvl 100 Porygonz).
Qc Storm sent out Deoxys-f (lvl 100 Deoxys-f).
--- Turn 1
Deoxys-f is exerting its Pressure!
Porygonz used Recover.
Porygonz restored 50% of its health.
Deoxys-f used Skill Swap.
Deoxys-f swapped Abilities with its opponent!
--- Turn 2
Alphacme switched in Togekiss (lvl 100 Togekiss ?).
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
--- Turn 3
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 4
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 5
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 6
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 7
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 8
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 9
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Double Team.
Togekiss's Evasion won't go higher!
--- Turn 10
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Baton Pass.
Alphacme switched in Alakazam (lvl 100 Alakazam ?).
--- Turn 11
Alakazam used Trick.
Alakazam obtained Mystic Water!
Deoxys-f obtained Choice Specs!
Deoxys-f used Psycho Boost.
Deoxys-f's attack missed!
--- Lulz
Qc Storm: Ready For Rape?
Alphacme: Fuck Yeah!
--- Turn 12
Alphacme switched in Croagunk (lvl 1 Croagunk ?).
Croagunk's Anticipation made it shudder!
Deoxys-f used Psycho Boost.
It's super effective!
A critical hit!
Croagunk lost 11380091% of its health.
Alphacme's Croagunk fainted.
Deoxys-f's Special Attack was harshly lowered.
--- Conclusion
Total Theoretically HP Lost: 1 365 610.92
Just for the sake of precision, I'll explain the moves we did.
Recover: A filler move really; we didn't wanted to hurt/kill Deoxys.
Skill Swap: Psycho Boost is Psychic-type, Deoxys is Psychic-type, it's just a boost.
Calm Mind: To raise Deoxys' Special Attack to the maximum.
Double Team: A safe way to make sure we could dodge one Psycho Boost to use Trick.
Trick: To boost Deoxys' Special Attack even more... not sure if it stacked with Calm Mind...
Psycho Boost: Strongest attack we could think of for this scenario.
And yes, the critical hit was pure luck and we got it on our first try... no joke.
Done by Alphacme/Qc Storm.
Rules: OHKO Clause, Sleep Clause, Species Clause
Alphacme sent out Porygonz (lvl 100 Porygonz).
Qc Storm sent out Deoxys-f (lvl 100 Deoxys-f).
--- Turn 1
Deoxys-f is exerting its Pressure!
Porygonz used Recover.
Porygonz restored 50% of its health.
Deoxys-f used Skill Swap.
Deoxys-f swapped Abilities with its opponent!
--- Turn 2
Alphacme switched in Togekiss (lvl 100 Togekiss ?).
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
--- Turn 3
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 4
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 5
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 6
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 7
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack was raised.
Deoxys-f's Special Defence was raised.
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 8
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Double Team.
Togekiss's Evasion was raised.
--- Turn 9
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Double Team.
Togekiss's Evasion won't go higher!
--- Turn 10
Deoxys-f used Calm Mind.
Deoxys-f's Special Attack won't go higher!
Deoxys-f's Special Defence won't go higher!
Togekiss used Baton Pass.
Alphacme switched in Alakazam (lvl 100 Alakazam ?).
--- Turn 11
Alakazam used Trick.
Alakazam obtained Mystic Water!
Deoxys-f obtained Choice Specs!
Deoxys-f used Psycho Boost.
Deoxys-f's attack missed!
--- Lulz
Qc Storm: Ready For Rape?
Alphacme: Fuck Yeah!
--- Turn 12
Alphacme switched in Croagunk (lvl 1 Croagunk ?).
Croagunk's Anticipation made it shudder!
Deoxys-f used Psycho Boost.
It's super effective!
A critical hit!
Croagunk lost 11380091% of its health.
Alphacme's Croagunk fainted.
Deoxys-f's Special Attack was harshly lowered.
--- Conclusion
Total Theoretically HP Lost: 1 365 610.92
Just for the sake of precision, I'll explain the moves we did.
Recover: A filler move really; we didn't wanted to hurt/kill Deoxys.
Skill Swap: Psycho Boost is Psychic-type, Deoxys is Psychic-type, it's just a boost.
Calm Mind: To raise Deoxys' Special Attack to the maximum.
Double Team: A safe way to make sure we could dodge one Psycho Boost to use Trick.
Trick: To boost Deoxys' Special Attack even more... not sure if it stacked with Calm Mind...
Psycho Boost: Strongest attack we could think of for this scenario.
And yes, the critical hit was pure luck and we got it on our first try... no joke.
Done by Alphacme/Qc Storm.
*No Pokemons were harm during this experiment... except one Croagunk.*