Unfortunately it is currently impossible to buy a pattern through Ravelry. Pattern is available here :

https://dailydoll.shop/shop/mike-wazowski-keychain-croche...

Size: 4.7 inches /12 cm tall when made with the indicated yarn.

Abbreviation:
Sc-single crochet
Slst-slip stitch
Inc-increase
Dec-invisible decrease

Materials:

• Green yarn ( 1,76 oz/ 174 yds, 55% cotton, 45% PAC)
• Light Blue yarn ( 1,76 oz/ 174 yds, 55% cotton, 45% PAC)
• Black yarn ( 1,76 oz/ 174 yds, 55% cotton, 45% PAC)
• 2,5 mm crochet hook
• Black yarn (0,88 oz/164 yds, 100% cotton) for mouth
• White yarn ( 1,76 oz/ 174 yds, 55% cotton, 45% PAC)
• Scissors
• Stitch marker
• A long tapestry needle
• Fiberfill for stuffing
• Keychain