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snorlax is pretty much the peak example of a good roadblock.
>requires the player to unlock themselves with a tool they gain instead of it arbitrarily vanishing after x point like pretty much every retarded gen 5 roadblock
>triggers a battle that gives you the chance to catch a rare new pokemon that's decently challenging to catch
>two different locations so you can still pick which way to progress
first fucking game in the series they designed a good roadblock and then they just regressed from there.