Pocket dragon is page 31 of the Red Creature Catalog, 75 on the green one
Amber Dragon is the Brown dragon, with rules variations detailed in 2e Monstrous Compendium
Lesser Night Dragon is in Champions of Mystara
Greater Night Dragon is Synn, she's also in CoM as well as Glantri boxed set
Undead dragon is page 32 of Red Catalog
Sea Dragon is page 31 of Red catalog
Mystara has 3 monster manuals, but with a ton of overlap, especially between the green and red ones. There's also a lot of dragon-ish creatures, but I figured you wanted true dragons only.