Tentaquil is a kind of blue frog/toad of some sort. It has a golden spiral on its belly, and long claws. Tentaquil's stomach suffers from such a strong gastritis that it has the power to puke blood with a pressure of 997,999,993 psi holy shit.
As of the March 2020 update, Tentaquil is no longer able to trigger the bad ending after defeating the champion.
It learns no Psychic-type moves by leveling up despite being a Psychic type. There's no joke to this; it's just a retarded decision.
Tentaquil is the only Pokémon from Pokémon Clover to appear in a licensed game published by Nintendo, appearing in Scribblenauts Unlimited for the Wii U, as seen here.
Design & Name Origin
Do you really not know what Tentaquil is based off of? It's a Tentaquil. Show some respect.
Back in 2010, there was a thread on /vp/ to draw your favorite Pokémon without looking. Someone drew this.
When asked what it was, the creator replied "It's a Tentaquil". A romhack was later made called "Pokémon: Tentaquil Edition", in which the player's only Pokémon is Tentaquil with his signature move "Puke Blood". The creator might've meant Tentacool/Tentacruel/Politoed/Quagsire/Cyndaquil.
Tentaquil soon become a hit meme on /vp/, with its signature move of vomiting blood.