Shibalien is the first Alien enemy that is encountered. Shibalien is a variant of Doge but much stronger. However, Doge Dark, Gabriel andMetal Doge are still stronger than him as Doge Dark and Gabriel are both fast, Gabriel has area attacks, and Metal Doge has the Metal ability. His appearance is also distinctly different; he is blue like the other Alien enemies, he has tentacles instead of legs, and he does not have eyebrows unlike most other variants of Doge. Using two Lion Cats can get the job done fast. If you have all anti-Alien Treasures from Into the Future, the Cat Cannon can instantly kill Shibaliens as long as they are not buffed.
When you first encounter him in Itf Japan, do not underestimate him. He has 6300 HP and can deal 1050 damage due to the 700% buff, enough to quickly defeat even Mythical Titan Cat. However, cats like Dragon Cat or Sexy Legs Cat can dish out lots of damage and eventually kill him.
If you have Valkyrie Cat, this enemy should be pretty easy, and if you have Bahamut Cat, this enemy should be trivially easy.
Later on, Shibalien becomes a peon for stronger aliens or enemies. Any cat should be able to deal with him at this point...