'Good to Go' for World Series

Good news, bad news for Dodgers fans ... Cody Bellinger says he was still in pain on Monday after dislocating his shoulder Sunday night -- but insists he's "good to go" for the World Series.

... this according to Cody's dad, Clay Bellinger.

"I talked to him a little bit after the game, he said it was really really sore," Clay tells TMZ Sports ... "It was sore yesterday."

"I just texted him a little bit ago, and he said he was good to go. [The pain] is there a little bit, but he's going to play and he's going to swing."

Cody popped out his shoulder Sunday night while celebrating his game-winning home run against the Atlanta Braves with a jumping forearm bash with teammate Kike Hernandez.

Bellinger…