
Charizard Mega Y is an overwhelming special sweeper. Retaining its Fire/Flying typing, its Drought ability immediately sets up harsh sunlight. Combined with its massive Special Attack stat, it decimates opposing teams using Heat Wave and Solar Beam.
Charizard Mega Y pairs perfectly with speed control (like Tailwind from Whimsicott) and Chlorophyll users that thrive in the Sun. It also appreciates redirection to sweep safely.
Defeating Charizard Mega Y is best achieved by changing the environment or outspeeding it.
Aerodactyl outspeeds Mega Charizard Y and lands a double-weakness Rock Slide for an instant KO.
Pelipper is also a top check, immediately setting rain with Drizzle to override its Drought sun and neutralize its Fire-type damage.
The best moveset for Charizard-Mega-Y in the current competitive meta typically features the moves Protect, Heat Wave, Solar Beam, Weather Ball.
In the Pokémon Champions meta, Charizard-Mega-Y can be countered by exploiting its weaknesses (rock 4x, electric 2x, water 2x) and using effective check/counter teams.
The best item for Charizard-Mega-Y is typically Charizardite Y, based on high-level tournament and ladder stats.