Youcan is a slightly faster variant of Two Can. Like Two Can, it has two traits, which are also a big weakness: in this case, those traits are Angel and Alien. Like his variant, Youcan can perform powerful wave attacks, but it also has an extremely tough barrier (266,000 HP!). Barrier Breaker cats are almost mandatory to defeat this enemy. Aside from that, strategies to defeat Youcan are similar to what would be used against Two Can.
Strategy
When first encountered, either in late Stories of Legends or in Church of Mercator, this enemy can be lethal without all treasues from Cats of the Cosmos, so make sure to have them all before fighting this enemy.
Despite Youcan's obscenely strong barrier, the large amount of Barrier Breakers and the Breakerblast Cannon make this a trivial issue. There are even a few Ubers and Legends that are capable of breaking through with sheer attack power alone, to add on that. Just make sure to have one of these options before entering a stage with him, otherwise it's game over. Also, if relying on a Barrier breaker, make sure that you have a way to tank the damage or block the shockwaves.
Dealing with the waves is important; for that, Octopus Cat, Cat Machine Mk 3, Eva Unit-00 and Hatsune Miku: MM2020 Tokyo can each used to block Youcan's waves. The latter two are additionally resistant to Youcan's attacks and have massive health, also being able to outrange Youcan. Note that, unlike Two Can, this enemy has area attacks, so Mightycat will not work.
Ramen Cat can provide tough defense against Youcan, although a non-Angel enemy getting in the way may make his resistance useless.
An extra-confident bird named by his parents who wanted him to always believe in himself. His arrogance is so extreme that it consumed his home dimension and drove him to this one.
*In each stage, there is strength magnification, the value of health and attack power varies due to this value.
Trivia
This enemy's name is a play on words 'you can'. This is further supported by his description saying that this enemy is over-confident, most likely from others saying "you can!"
This enemy has the same barrier HP (266k) as UltraBaaBaa.
These two enemies have the highest barrier HP.
In the Korean version of The Battle Cats, his name is 'dehmongyee', (not correctly spelled) known as having big hopes and dreams.
Youcan is the first Alien to have a second trait other than Floating.
Youcan is also the only non event angel enemy with a secondary trait.