Can a Empoleon defeat Dialga?

Empoleon is a Water/Steel-type Pokémon, and Dialga is a Steel/Dragon-type Pokémon. Water-type attacks are not very effective against Steel-type Pokémon, and Steel-type attacks are not very effective against Dragon-type Pokémon. However, Empoleon's Steel-type attacks are super effective against Dialga's Dragon-type. Additionally, Empoleon has the ability to learn Ice Beam, which is an Ice-type attack that is super effective against Dialga's Dragon-type. Therefore, it is possible for an Empoleon to defeat a Dialga, but it would be difficult.