In the mainline Pokmon games, Kabutops is obtained by reviving the Dome Fossil, an item exclusive to select games like 'Pokmon Red, Blue, and Yellow' and their remakes, 'Pokmon FireRed and LeafGreen.' It represents the choice between the Dome and Helix Fossils, a decision that has become iconic in Pokmon lore
For example, against a Calyrex-Shadow VMAX deck, Ultra Necrozma needs 2 hits to KO Calyrex-S and take 3 prizes, while Calyrex-S needs 3 hits to take 3 prizes (by KOing 3 Necrozmas)
The past is yours to explore
The more cards your opponent has in their hand, the faster MirageGaogamon will bring you victory
Rebirth might be looking for an exemption based on lore, but no way