Use a strong fire type or any other type but they have to be strong
Water Pokemon. You can also use rock Pokemon such as geodude or onix. Do not use grass or steel Pokemon these types are week against fire.
What hurts rock/ground types the most is water type. NEVER EVER use an Electric type against rock type.
Since Charizard is the Fire/Flying-type Pokemon, it is recommended to use physical Electric, Rock, and Water-type attacks.
Ground type Pokemon are super-effective against electric so I suggest that you use Pokemon of that type.
A Water Pokemon's weaknesses are Electric and Grass. Basically any type of Pokemon can beat a water Pokemon if it's strong enough, but Electric and Grass attacks do 2X damage against Water types. Water types also only take half damage from Fire, Ice, Steel, and Water attacks, so those wouldn't be the best ones to use. Water attacks do half damage to Dragon, Grass, and Water Pokemon. Its strengths are against Fire, Ground, and Rock.
Kingdra is a Water and Dragon type pokemon.
Water Pokemon. You can also use rock Pokemon such as geodude or onix. Do not use grass or steel Pokemon these types are week against fire.
For his Dragonites (x3), have Ice-Type Pokemon at hand. For Charizard, have a Water-Type Pokemon. For his Gyarados, have a Electric-Type Pokemon. For his Aerodactyl, have a Water-Type as well. The 2nd time you face him: Use Ice or Electric Moves or Pokemon against his Salamence. Use Ice or Water Moves or Pokemon against his Garchomp. Use Ice or Electric Moves or Pokemon against his Altaria. Otherwise, he has a Dragonite, Charizard, and Gyarados. Just read above to know how to handle them.
An electric type, water type, psychic type, ice type, grass type, fire type.
Use a powerful rock, water, or ground type against it.
Clay, the fifth Gym Leader, uses Ground-Type Pokemon, so Water-Type Moves are good against it. One of his Pokemon is Palpitoad, which is a Water- and Ground-Type Pokemon, so it's probably best not to use Fire-Type Pokemon against this one. The other two Pokemon are Krokorok and Excadrill. Hope this helps.
You need to know there weakness... They use Water type Pokemon, and Water type Pokemon are weak against Grass type attacks... If you're using Fire type, then that's maybe the reason, 'cause Fire type attacks deal less damage against Water while Water attacks deal high damage against Fire.
Tate and Liza the Mossdeep Gym Leaders use Psychic-type Pokemon so the best option to use would be either Dark-type Pokemon or Ghost-type Pokemon however Bug-type Pokemon will work as well additionally Steel-type Pokemon have a resistance against Psychic attacks and Steel-type attacks are super effective against Pokemon that are part Rock-type which Lunatone and Solrock are.
What hurts rock/ground types the most is water type. NEVER EVER use an Electric type against rock type.
use a water type because if its fire it will burn him.if you use water use a great ball, master ball if you had one,and poke ball. if i were you use a great ball.
Since Charizard is the Fire/Flying-type Pokemon, it is recommended to use physical Electric, Rock, and Water-type attacks.
water Pokemon such as blastoise wartortle squirtle tentacool tentacruel... ect.