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In the past, Foster was exploring the Ruins of Alph. It was there he discovered that the Fossil Pokémon Omanyte and Omastar were living there. Later on, he invited Professor Oak who then invited Ash and his friends to the Ruins so they could see them. Although he initially lied to Oak and Ash and his friends, saying that the Fossil Pokémon he showed them were mechanical Pokémon, Ash and his friends eventually saw through this after noticing that the Omanyte and Omastar were behaving in a way that looked too real for any of them to be robots. In fact, Foster tried to protect them, because they were so rare.
After Team Rocket attacked the Ruins and tried to steal the Pokémon, both Foster and Oak thought it would be best to leave the Omanyte and Omastar alone. Ash and the others agreed, and after saying goodbye to the Professor and Foster, they never mentioned the Fossil Pokémon again.