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Just beat Red. Everyone on the team is level 51, save for Heracross who I candied up to 54 for Megahorn before the fight. All that's left is to grab the few Johto mons I missed and then get to SRing for shiny Ho-Oh.
Mt. Silver was fairly disappointing. I remembered it being bigger, probably because of HGSS, but it's just three small rooms. GSC has a real problem with caves and dungeons being underwhelming or functionally nonexistent.