Rainbow Dash vs Poseidon (Saint Seiya): who would win?

Too close to call

Rainbow Dash · My Little Pony · Elements of Harmony/Magic of Friendship

Tier

2-A, up to LOW 1-C

Attack Potency

Multiverse Level+, up to Low Complex Multiverse Level

Speed

Infinite

Durability

Multiverse Level+, up to Low Complex Multiverse Level

Poseidon (Saint Seiya) · Saint Seiya · Divine Cosmos / True Body

Tier

2-A, up to LOW 1-C

Attack Potency

Multiverse Level+, up to Low Complex Multiverse Level

Speed

Infinite

Durability

Multiverse Level+, up to Low Complex Multiverse Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.