>>44775821In DP, anon. Platinum doesn't require it, but in DP you need Strength to actually get to the 2nd floor where Gible is, and Strength isn't usable until you beat the 6th gym.
That said, I wouldn't say it's when you're preparing for the 7th gym considering you can use Strength as soon as you beat the 6th gym and there's most of the lake shit plus the trek up to Snowpoint after that.
