|Prior forms||Anyone + B Holy Spirit of Water|
Rivieramon is a Mega-class Beast Hybrid Digimon whose name is derived from the Italian word, Riviera, which means "coastline", and from river, a natural flowing watercourse; this also signifies her role as the Goddess of Water. She is the Beast Holy Spirit of Water, created by King Royalmon as well as Queen Majestymon, the parents of Prince Signamon.
Rivieramon is Aquamon's Beast form, which she undertakes when she slide evolves using the B Holy Spirit of Water. She is Aquamon's raw power form. Rivieramon is Aquamon's main battle form, when she needs to deal immense damage. She now takes the form of a alligator-like creature. Like with the other Beast Spirits, Rivieramon is noticeably beastly than her Aquamon appearance, but Rivieramon's personality remains the same in this form. She was of the second of the Elemental Gods to obtain her Beast Spirit while in the Dark Area. The Venus symbol the other with the symbol representing the Spirits of Water are now imprinted on her body. Despite the ability of being on land, Aquamon rarely uses this form when she is not near a body of water. When underwater, Rivieramon's true potential is shown, she is often seen with Velesmon, the Beast Spirit of her twin brother Cetusmon. She is unable to completely control her Spirit at first use, though she trains herself, and grows to master it.
- Water Oath – Rings form around Rivieramon's eyes, which summon giant pillars of water to rush towards her opponent. When the pillars reach the opponent, they form a ring of pillars and then merge into one giant water pillar, damaging the opponent.
- Boiling Water – Rivieramon releases a stream of scalding hot water surrounded by steam from her mouth at the opponent.
- Aqua Jet - Rivieramon's body becomes surrounded by water and she shoots into the air like a rocket, slamming into the opponent.
- Hatred Fang - Rivieramon's two front teeth glow white and they grow longer. Rivieramon then bites down on the opponent with her teeth.
- Brine - Rivieramon fires a powerful stream of water from her mouth at the opponent.
- Tail Attack - She can attack her opponents using her powerful tail.