My Pika Cup TAS (test TAS)
Part 1
video removed
Part 2
video removed
Starting fresh (Round 1 TAS) with Mupen64 rerecording, setting up registered Pokemon with your custom teams is not possible for VS Mewtwo as you can only use rentals.
Just use Jackster's save here for a Round 2 TAS if you want a custom team to face Mewtwo:
http://www.zophar.net/download_file/12898
Pika Cup: Starmie-only run?
Level 20 Starmie
Surf/Psychic/Blizzard/Thunder
EVs: 65535 Speed, 65535 Special
IVs: 3 HP, 15 Speed. 15 Special
5 Level 15 rentals are your fillers.
Petit Cup: Which Pokemon's the best? Abra? Gastly? Dratini? You decide.
Level 30 Abra
Psychic/?/?/?
EVs: 65535 Speed, 65535 Special
IVs: 3 HP, 15 Speed. 15 Special
2-5 Level 25 rentals are your fillers.
Poke Cup: The three birds and Dragonite are your best bets.
Level 55 Articuno
Blizzard/BubbleBeam/?/?
EVs: 65535 Speed, 65535 Special
IVs: 3 HP, 15 Speed. 15 Special
Level 55 Zapdos
Thunder/Drill Peck/Hyper Beam?/?
EVs: 65535 Attack, 65535 Speed, 65535 Special
IVs: 11 HP, 15 Attack, 15 Speed, 15 Special
Level 55 Moltres
Fire Blast/Double-Edge?/?/?
EVs: 65535 Attack, 65535 Speed, 65535 Special
IVs: 11 HP, 15 Attack, 15 Speed, 15 Special
Level 55 Dragonite
Hyper Beam/Double-Edge/Agility?/Horn Drill?
EVs: 65535 HP, 65535 Attack, 65535 Speed
IVs: 10 HP, 15 Attack, 15 Speed
2 Level 50 rentals are your fillers.
Prime Cup/Gym Leader Castle: Mewtwo pwns all. Peroid.
Level 100 Mewtwo
Psychic/Fire Blast/Blizzard/Thunder
EVs: 65535 Speed, 65535 Special
IVs: 3 HP, 15 Speed. 15 Special
5 rentals are your fillers.
Vs. Mewtwo: Use Mew's Explosion? or strategize with Venusaur for entertainment?
Level 100 Mew
Explosion
EVs: 65535 Attack
IVs: 8 HP, 15 Attack
Level 100 Venusaur
Double Team/Toxic/Leech Seed/Razor Leaf
EVs: 65535 HP, 65535 Special
IVs: 15 HP, 1 Attack, 1 Defense, 1 Speed, 15 Special
Either one, no rentals