Gomamon EX8-018, Dolphmon EX8-020, Whamon EX8-025, and Plesiomon EX8-027 by naru from EX-08 Extra Booster Chain of Liberation

seen from Poland
seen from Poland
seen from United States
seen from United States
seen from United States
seen from Chile
seen from Germany
seen from Romania
seen from United Arab Emirates

seen from Morocco

seen from United States

seen from Italy
seen from United Kingdom
seen from China
seen from United States
seen from United Kingdom
seen from Ukraine
seen from Italy

seen from United States
seen from Morocco
Gomamon EX8-018, Dolphmon EX8-020, Whamon EX8-025, and Plesiomon EX8-027 by naru from EX-08 Extra Booster Chain of Liberation
Gomamon (X Antibody) BT15-021 and Plesiomon (X Antibody) BT15-032 by koki from BT-15 Booster Exceed Apocalypse
Regalecusmon BT4-034 and Plesiomon BT14-029 by Nakano Haito from BT-04 Booster Great Legend and BT-14 Booster Blast Ace
These cards by the same artist depict a fight between the two marine Ultimates!
Brachiomon BT10-022 by Kazumasa Yasukuni from BT-10 Booster Xros Encounter
This Brachiomon Card from BT10 is a reference to the Brachiomon you can meet in the Ancient Dino Region in Digimon World.
So yesterday we talked about how Shakkoumon's main evolution used to be Vikemon. But we all know Vikemon as the final evolution of Gomamon. Before the switch from Vikemon to ClavisAngemon for Shakkoumon, Gomamon's final evolution used to be Plesiomon!
Plesiomon EX3-023 by Ishibashi Yosuke from EX-03 Theme Booster Draconic Roar
This is also why it was featured in the EX-01 Classic Set, among otherwise mostly classic Digimon Adventure Digimon.
While we did have Vikemon as a possible evolution for Zudomon in games before, I believe the first time it was used as warp evolution of our Adventure Gomamon was in the Digimon Adventure PSP game.
We have both lines represented in the card game, with Vikemon in BT2 and Plesiomon in ST2.
Personally, I feel like Plesiomon works really well as a final evolution for Gomamon, while Vikemon feels like a more natural progression from Zudomon.