Youcan (大夢くん Daimu-kun, Daimu-kun) is a Starred Angel/Alien enemy that only appears in the Legend Stages. It was added in the 6.6 update.
Youcan is a slightly faster variant of Two Can. Like Two Can, it 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.
Despite Youcan's obscenely strong barrier, there are a few Ubers and a Legend that are capable of breaking through with sheer attack power alone. Jizo's Moving Castle can destroy Youcan's Barrier in one hit if it's at least level 26 and if the player has all Heaven's Fruit Treasures, however Jizo's Mega-Castle must be level 33. Hallowindy can break the barrier at level 37 with all anti-Alien treasures. Lufalan Pasalan can break the barrier at level 33 if he performs a Critical Hit. Colossal Benkei can break the barrier at level 25 with all anti-Angel treasures. Catman can break the barrier at level 50 with all anti-Alien or anti-Angel treasures.
Fencer Cat's 100% chance of breaking barriers can also help greatly in stages with Youcan. Li'l Macho Leg Cat only has a 30% chance to break barriers, but their 30% chance to knockback Aliens can repeatedly interrupt Youcan's long attack animation when stacked.
Octopus Cat, Cat Machine Mk 3 and Eva Unit-00 can be used to block Youcan's waves. The latter two are additionally resistant to Youcan's attacks and have massive health pools, while Eva Unit-00 also stands outside of their attack range.