|Jolteon (Let’s Go Pikachu)||57||Electric|
|Raichu (Let’s Go Eevee)||57||Electric|
Here we are! The final boss, so to speak. Your rival is a bit smarter than most trainers. He may occasionally switch out his Pokémon if it’s disadvantaged against yours. He is also carrying 3 Full Restores to completely restore his current battling Pokémon.
As always, he sends out his Pidgey, which is now a Pidgeot. Not only that, but it’ll Mega Evolve straight away, greatly enhancing its Special Attack and Speed. It’s still weak to Electric, Rock and Ice though. For attacks, it has Air Slash for STAB, Heat Wave to melt Ice-types, and Quick Attack. Lead with an Electric or Rock-type if you can.
Next, he may send out Marowak, which he evolved from Cubone. This pure Ground-type can use Bonemerang for STAB, Fire Punch to burn Grass-types, and Brick Break to smash Ice-types. That leaves Water-types as the safest choice. That or Flying if you want to dodge its Bonemerang. Gyarados is a great pick.
Vileplume you should remember from last time. This fully evolved Oddish is weak to Fire, Ice, Flying and Psychic. It can attack using Sludge Bomb and Solar Beam, although the latter requires a turn to charge. It can also use Reflect to weaken physical attacks. All of the aforementioned Types are safe to use.
He also has a Rapidash, an evolved Ponyta. This speedy horse can use Flare Blitz for STAB, Poison Jab to punish Fairies and non-Poison Grass-types. Plus Quick Attack to try and surprise you. It’s got nothing to deal with resistant Water or Rock-types, nor Ground-types.
Moving on, we have Slowbro, an evolved Slowpoke. It’s weak to Grass, Electric, Bug, Ghost and Dark. Your rival’s Slowbro can use Surf and Psychic for STAB, and Light Screen to weaken special attacks. It has lower Special Defense than Defense, so hit it with special attackers before it can use Light Screen.
Finally, your rival can send out Jolteon in Let’s Go Pikachu. This super-fast Electric Eevee can use Thunder for STAB, Pin Missile to hurt non-Poison Grass-types, and Quick Attack to sneak an attack in. Ground-types are the best choice here, since Thunder is pretty much Jolteon’s only good move.
Alternatively, your rival can send out Raichu in Let’s Go Eevee. Like Jolteon, it can use Thunder and Quick Attack. But in place of Pin Missile, it has Iron Tail to damage Rock and Fairy-types, etc. Similarly, Ground-types are ideal to force Raichu to use its crappy non-Thunder moves.
Succeed in defeating your rival for the umpteenth time and you’ll steal the title of Champion from right under him. Afterwards, you’ll be automatically taken to the place only Champions may enter: the Hall of Fame. Your Pokémon party will be registered via a special machine. From there, you can sit back and enjoy the credits roll. Congrats on beating the game!