From the official Japanese Twitter account, Gomamon’s evolution first introduced in the 1998 Pendulum 2.0: Deep Savers virtual pet.

Card Number | BT1-034 | Level | 4 |
Card Type | Digimon | Play Cost | 5 |
Color | Blue | Evolution Cost | 2 |
Digimon Type | Marine Animal | DP | 5000 |
Attribute | Vaccine | Rarity | Rare |
Stage | Adult | Artist | shosuke |
Main Effect | — |
Source Effect | [During your turn] This Digimon cannot be blocked by your opponent’s Digimon with no Evolution Sources. |
Booster 1 launches in Japan on May 15th, 2020.