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[Dragonstrike]

Just correcting something: all ungrounded mons lose their Ground immunity when using Roost. That goes for Flying-types, Levitate and Magnet Rise users and Air Balloon holders.

Except Roost's effect applying only to removing the Flying type is exactly why Latias/Latios are commonly known to use Roost instead of Recover, right?  I remember Smogon mentioning at one point that they run that move specifically for those cheeky instances where someone tries to EQ them as they Roost because they forget that the move doesn't remove Levitate's immunity to Ground.

Plus, Bulbapedia only mentions the move applying to the Flying type as well.  There's no mention of it applying to other methods of a pokemon being ungrouded. Air Balloon, Levitate, Magnet Rise, Telekinesis, etc. are all cheeky 'exceptions to the rule' because all Roost does is remove the user's Flying type (if any) until the end of the turn.

Regardless, unless I was running Coatlith on a dedicated Sun team of some variety and was reasonably certain my opponent wouldn't try to switch a M-Electruxo, Yatagaryu, or Escartress in on the predicted recovery move, I would always use Roost on it over Synthesis if I needed a recovery move.