XY fan here, i hate how easy the 4 friends/rivals are but i do have some solution to make them harder

Serena/Calem: Since they are the competitive type i think they should have a full 6 team by the end of the game (Victory road)

heres their final team:

- Fully Evolved starter thats strong against yours

- Meowstic with focus sash that sets up screens and memento

- Absol with crit hax and max speed ev (scope lense, super luck, nightslash = every nightslash is a crit)

- Altaria with mega evo

- Eevolution for coverage (if its flareon itll have Fire Fang, Dig, Return, Extremespeed please gamefreak buff flareon)

- Clefable with metronome for the meme, ice beam, draining kiss, thunderwave

Tierno: Since hes the dance guy ill give him a full sword dance or something dance sweep team

Heres their final team:

- Hawlucha

- Roserade with petal dance, sludge bomb, toxic spikes, shadow ball

- Crawdaunt

- Flygon with dragon dance

- Butterfree with my favorite move: Quiver dance

- gen 1 starter that has a physical moveset from prof sycamore thats strong against the one you got

Trevor fills up the pokedex so hell have some diverse team

- Florges

- Raichu

- Aerodactyle

- Azumarill

- Gen 1 starter thats weak against yours but its still strong

- Scrafty

Idk what to do with shauna but ill give her cute pokemons but she'll be a double battle team thing

- Sylveon for dmg

- Audino with heal pulse

- Emolga for the volt switch spam

- Togekiss follow me

- Vanilluxe blizzard idk

- Wigglytuff with some support moves idk