I like the idea of Sunrise Temple, the traps in it and I do like the SR. Everything you said, I mostly agree with. But maybe the end of ST is not the place for Larvesta to be through the use of honey.
I think letting Larvesta be available mid game through an egg is great for newer players, so the egg gets usage. Perhaps if Larvesta could be available in one of the endgame dungeons as a recruit, it would feel better (SR or regular recruit, doesn’t matter. As long as it’s not in an egg or locked behind a puzzle). I can see Larvesta being a recruit at the last floors of SVW (?), or maybe available through an SR in that place. That’s not up to me, though.
And again, nothing against the SR. I actually like it. But it probably won’t be the best if it’s the one place you can shiny hunt a larvesta in. This is a nice follow up on my thread from a few days ago, so thanks for posting about it. Together we can come to a good solution, I think.
I also think you -might- have missed the point of his thread. Maybe read again?