Yin-Yarn vs Libra Dohko: who would win?

Yin-Yarn favored — Slight edge (~55%)

Yin-Yarn · Kirby · Mega Yin-Yarn

Tier

4-A

Attack Potency

Multi-Solar System Level

Speed

Massively Ftl+

Durability

Multi-Solar System Level

Libra Dohko · Saint Seiya · Sanctuary Arc

Tier

4-A, up to 2-A

Attack Potency

Multi-Solar System Level, up to Multiverse Level+

Speed

Speed Of Light

Durability

Multi-Solar System Level, up to Multiverse Level+

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