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Unreleased music, probably Movie 7's unused BGM. It's also possible that it's the beginning part of our version of the track
Movie 7 BGM - Underground Hideout (that played right after the one below), where only the part recorded in the site's database was heard in the movie, but the previous part existed and remained unused by the anime producers in the full-length feature. Still, it's just a theory and the track should be marked as a regular unreleased BGM.
There's a similar case with an unused music from Movie 2 (I'm absolutely sure it's from Movie 2, but wasn't used in the movie itself), but I won't bring it up seriously until at least the end of DP.
I hope I made myself clear.
AG 172 - 05:47 (Hinata explains to the group that last week strange things began to happen around the Pokémon Center.)
And there's more:
AG 191 - 13:37/14:27 (Regirock and Regice repel Rocket Gang, sending them blasting off.) / (Jindai sends out Regice.)
17:31 (Satoshi tries to wake Pikachu up by remembering their previous battles together.)
AG 193 - 13:50 (Shigeru reveals to Satoshi that Elekible is a Pokémon native to Shinou. Satoshi then reaches Masara Town.) - I thought this one was already in the database (sounds like from Movies 4 or 5), but can't find it for some reason. I think it's probably just my brain confusing the track with another. Yeah, the variety of music at this point in the series is already very high. AAARGGGHH! :D
I'd appreciate if someone went through the unreleased music and tried to find this piece there.