From Bulbapedia, the community-driven Pokémon encyclopedia.
The Water 3 Egg group (Japanese: すいちゅう3 Underwater 3) is one of the fifteen Egg groups. Like its counterparts Water 1 and Water 2, it is mostly made up of Water-type Pokémon.
The Water 3 Egg group is mostly characterized by its members' resemblance to aquatic invertebrates; most are Water types. This group also contains most Fossil Pokémon, containing most of the Generation I Fossils, the Generation III Fossils, and oddly enough, the Generation V Fossils, despite not being based on invertebrates. The Generation IV Fossil Pokémon and Aerodactyl instead belong to other Egg groups.
It is a relatively small Egg group. Most Pokémon that are capable of breeding into other Egg groups breed into the Water 1 Group.
Only in this Egg group
In this and another Egg group
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