DNA Skills are unlocked at lvl 60 together with Sky Pillar. Each Pokémon has their own DNA Skill, and it cannot be changed.
Each Pokémon has 3 Genes:
- Primary Gene
- Almighty Gene
- Enhanced Gene
Each of those Genes provide stats, and they can be upgraded with items that you obtain from the Sky Pillar.
The most important Gene is the Almighty Gene which is the one that will unlock your DNA Skill:
Before investing on a pokémon, you can read the pokémon's DNA Skill and decide if it's worth the investment.
You can read this DNA Skill on your pokémon directly like this: