Azurill / Marill / Azumarrill

Azurill is a round, blue mouse Pokémon. It has circular ears with pink insides. There are two white dots on its cheeks, and it has black eyes. Its thin, black, zigzagging tail has a large blue ball at the end about the same size as its body.
The ball is bouncy and packed with the nutrients it needs to be able to grow. The ball can also be used as a flotation device. It can be seen bouncing and playing on this rubbery tail. The tail can also be spun around like a lasso. When the tail is thrown, the body can go as far as 33 feet (10 meters). Though Azurill is typically docile, it swings the big ball on its tail to smash into opponents bigger than itself when angered. It lives at the water's edge, where they gather to splash around for fun on sunny days.

Azurill

Its tail bounces like a rubber ball. It flings that tail around to fight opponents bigger than itself.

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Armor Class	11
Hit Points	2d4-2
Speed	30 ft.
Strength	3 (-4)
Dexterity	12 (+1)
Constitution	6 (-2)
Intelligence	6 (-2)
Wisdom	8 (-1)
Charisma	10 (+0)
Damage Resistances	Cold	Fire
Senses	Passive Perception 9
Languages	Sylvan
Challenge	0 (10 XP)
Special	Bounce	Azurill can jump or bounce up to 30 feet
Action	Tail Whip	Melee Weapon Attack	d20+3 to hit
Reach 5 ft., one target	Hit : 1 bludgeoning damage	and the next attack roll against the target before	the end of Azurill’s next turn has advantage

Marill is a small, blue, bipedal semi-aquatic rodent Pokémon. It has a nearly spherical shape with a white belly and round ears with red insides. These sensitive ears can detect distant sounds. Marill's arms and feet are short and possess no visible digits. There is a blue, bubble-like ball at the tip of its zigzagging black tail. The tail is flexible and configured to stretch, and the ball is full of oil that acts as a buoy to help keep Marill afloat. The ball at the tip of its tail can glow when Marill attacks. Marill has been seen bouncing on its tail.
Marill is able to swim in strong water currents without being slowed down by the water's resistance, due to its water-repellent fur. Marill feeds on aquatic plants in addition to fishing for food. When it dives, its tail can be seen bobbing on the water's surface. It will anchor its tail around a tree when fishing at the edge of a fast-moving stream. Marill never gets cold after swimming in cold water, due to its water-repellent fur drying up quickly the moment it leaves the water. It lives on the water's edge.

Marill

The fur on its body naturally repels water. It can stay dry even when it plays in the water.

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Armor Class	11
Hit Points	4d4-4
Speed	20 ft.	Swim 20 ft.
Strength	4 (-3)
Dexterity	12 (+1)
Constitution	8 (-1)
Intelligence	6 (-2)
Wisdom	10 (+0)
Charisma	12 (+1)
Damage Vulnerabilities	Cold	Fire
Senses	Passive Perception 10
Languages	Sylvan	Aquan
Challenge	1/8 (25 XP)
Action 1	Bubble	Ranged Weapon Attack	d20+3 to hit
Range 10/30 ft., one target	Hit 1d4+1 cold damage
Action 2	Tackle	Melee Weapon Attack	d20+3 to hit
Reach 5 ft., one target	Hit 1d4+1 bludgeoning damage
Action 3	Tail Whip	One creature within 10 feet must succeed on	a DC 11 Charisma saving throw
or attacks against it have advantage until	the end of Marill’s next turn

Azumarill is a blue, bipedal semiaquatic leporine Pokémon that has an ovoid body. The lower half of its body is white with a white, bubble-like pattern above it, which helps to camouflage it in water. It has elongated, rabbit-like ears with red insides and circular eyes. When in the water, it rolls up its ears to prevent the insides from becoming wet. Its arms and feet are short with rounded ends and no discernible digits. It has a black zigzagging tail with a blue, bubble-like tip. The tip of its tail tends to glow when it attacks or is excited.
Azumarill has highly developed hearing that allows it to hear distances, even when it is underwater. By keeping still and listening closely, it can identify prey even in wild, fast-moving rivers. If Azumarill spots a drowning Pokémon, it will make a balloon out of the air that helps them breathe. It lives in rivers and lakes and can live in the water all day long. In the anime

Azumarrill

Its long ears are superb sensors. It can distinguish the movements of things in water and tell what they are.

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Armor Class	13
Hit Points	8d6+8
Speed	30 ft.	Swim 30 ft.
Strength	10 (+0)
Dexterity	14 (+2)
Constitution	12 (+1)
Intelligence	6 (-2)
Wisdom	12 (+1)
Charisma	14 (+2)
Damage Vulnerabilities	Cold	Fire
Senses	Passive Perception 11
Languages	Sylvan	Aquan
Challenge	1/2(100 XP)
Special	Keen Hearing	Azumarrill has advantage on Wisdom	(Perception) checks that rely on hearing
Action 1	Bubble Beam	Ranged Weapon Attack	d20+4 to hit
Range 30/60 ft., one target	Hit 2d6 cold damage
Action 2	Play Rough	Melee Weapon Attack	d20+4 to hit
Reach 5 ft., one target	Hit 1d6+2 bludgeoning damage