- forme_base_pokemon_id = Column(Integer)
- evolution_chain_id = Column(Integer, nullable=False)
- evolution_parent_pokemon_id = Column(Integer)
- evolution_method_id = Column(Integer)
+ forme_base_pokemon_id = Column(Integer, ForeignKey('pokemon.id'))
+ evolution_chain_id = Column(Integer, ForeignKey('evolution_chains.id'), nullable=False)
+ evolution_parent_pokemon_id = Column(Integer, ForeignKey('pokemon.id'))
+ evolution_method_id = Column(Integer, ForeignKey('evolution_methods.id'))