For the generation this question is in: Dragon (Best from a Non-Dragon such as Gyarados or Charizard unless you have a very fast Dragon) or Ice (The majority of Dragons you encounter may be part flying making this 4x weakness).
The latter you must be careful with as quite often those Dragons will pack Fire Moves.
Starting as of Pokémon X and Pokémon Y, Fairy-type Pokémon can also beat Dragon-type Pokémon.
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you beat bird pokemon with electric pokemon
Ground type Pokemon can beat Electric type Pokemon easily.
no Pokemon can beat him.
well i have beat them in Pokemon diamond and u have to gust cheap on trying to beat them
you can go after the legendary pokemon, or beat him again.