Here we are, this is Prime Cup in Master Ball, and the Trainers are very difficult, and this is even more challenging with Rental Pokémon. I went with those that have some strategy against the Trainers, the ones are Graveler, Gengar, Exeggutor, Chansey, Starmie, and Jolteon, we'll see how they do against the Prime Cup Trainers. There is a secret in this game where if you complete Prime Cup Master Ball Round 2 with a Transfer Pak team that has a Pikachu, then it can learn Surf, Pikachu must be selected in the final battle in order for it to learn Surf. I will list each Trainers, and the nicknames of the Pokémon, with the species name of the Pokémon in brackets. Battle 1: Cueball scyther (Scyther): Slash, Swords Dance, Wing Attack, Hyper Beam ninetales (Ninetales): Fire Blast, Confuse Ray, Dig, Reflect cloyster (Cloyster): Ice Beam, Tri Attack, Surf, Supersonic jynx (Jynx): Blizzard, Lovely Kiss, Psychic, Body Slam raticate (Raticate): Double-Edge, Super Fang, Thunder, Quick Attack fearow (Fearow): Drill Peck, Double Team, Take Down, Toxic Battle 2: Judoboy Champ (Machamp): Submission, Focus Energy, Earthquake, Strength Pin (Pinsir): Double-Edge, Focus Energy, Submission, Seismic Toss Hitlee (Hitmonlee): Hi Jump Kick, Focus Energy, Mega Kick, Seismic Toss Flare (Flareon): Flamethrower, Focus Energy, Take Down, Fire Spin Vap (Vaporeon): Surf, Focus Energy, Ice Beam, Hyper Beam Jolt (Jolteon): Thunderbolt, Focus Energy, Double Kick, Body Slam Battle 3: Gambler Urosta (Tauros): Horn Drill, Body Slam, Fissure, Earthquake Pidashra (Rapidash): Horn Drill, Agility, Body Slam, Ember Triodug (Dugtrio): Fissure, Rock Slide, Body Slam Nitedrago (Dragonite): Horn Drill, Thunder Wave, BubbleBeam Bokar (Arbok): Fissure, Glare, Acid Queennido (Nidoqueen): Fissure, Body Slam, Horn Drill, BubbleBeam Battle 4: Rocket Nidoact1 (Nidoking): Earthquake, Thunder, Blizzard, Strength Golemact2 (Golem): Rock Slide, Fire Blast, Dig, Explosion Slowbract3 (Slowbro): Surf, Amnesia, Psychic, Thunder Wave Slashact4 (Sandslash): Earthquake, Seismic Toss, Slash, Sand-Attack Vaporact5 (Vaporeon): Hydro Pump, Acid Armor, Ice Beam, Body Slam Weezact6 (Weezing): Sludge, SmokeScreen, Hyper Beam, Explosion Battle 5: Lab Man Cruel-Tent (Tentacruel): Hydro Pump, Barrier, Double-Edge, Screech To-Dit (Ditto): Transform Gar-Gen (Gengar): Psychic, Hypnosis, Mega Drain, Confuse Ray Pidash-Ra (Rapidash): Fire Blast, Agility, Stomp, Toxic Butops-Ka (Kabutops): Hydro Pump, Swords Dance, Body Slam, Hyper Beam Buz-Electa (Electabuzz): Thunderbolt, Thunder Wave, Seismic Toss, Flash Battle 6: Cool♀ Venance (Venusaur): Mega Drain, Toxic, Leech Seed, Growth Victrance (Victreebel): Razor Leaf, Reflect, Sleep Powder, Hyper Beam Laprance (Lapras): Blizzard, Confuse Ray, Hydro Pump, Body Slam Electrance (Electrode): Thunderbolt, Thunder Wave, Hyper Beam, Explosion Alakazance (Alakazam): Psychic, Double Team, Recover, Reflect Snorlance (Snorlax): Body Slam, Rock Slide, Earthquake, Rest Battle 7: Birdboy Articash (Articuno): Blizzard, Fly, Double-Edge, Mist Moltrash (Moltres): Fire Blast, Fly, Take Down, Fire Spin Zapdash (Zapdos): Thunder, Thunder Wave, Drill Peck, Flash Charizash (Charizard): Flamethrower, Fly, Earthquake, Slash Gyaradash (Gyarados): Hydro Pump, Thunderbolt, Ice Beam, Hyper Beam Aerodash (Aerodactyl): Fly, Supersonic, Toxic, Hyper Beam Battle 8: Cool♂ Mewstor (Mew): Psychic, Softboiled, Tri Attack, Thunder Wave Starmistor (Starmie): Surf, Recover, Ice Beam, Swift Exeggustor (Exeggutor): Psychic, Leech Seed, Mega Drain, Explosion Taurostor (Tauros): Body Slam, Blizzard, Earthquake, Fire Blast Donstor (Rhydon): Earthquake, Fire Blast, Rock Slide, Surf Joltestor (Jolteon): Thunderbolt, Reflect, Thunder Wave, Hyper Beam I don't remember if I went over this, but you can select Mew as a Rental Pokémon in Round 2 of Prime Cup, its moves are Psychic, Metronome, Mega Punch, and Flash, I can see how hard it will be to register Mew into the Hall of Fame in the Nintendo Switch Online version of this game. The Trainers are a lot harder, and to list strategies, Judoboy has Focus Energy, and he has the Eevee evolutions on his team, Gambler uses 1-Hit KO moves, Cool♀ is the one that can give even Mewtwo a hard time, her Electrode has Thunder Wave, and it has higher Speed than Mewtwo, it is best to have a Pokémon like Rhydon as a backup to fight Electrode. In the final battle, Cool♂ uses the top competitive Pokémon, like Tauros, Starmie, Exeggutor, and Jolteon, and his Mew has Softboiled to heal some health, making it an even harder opponent because Psychic-type Pokémon had no weakness, aside from Bug, but it was a very weak attacking type.