Question

Which level is best for giving leaf stone to Exeggcute in LeafGreen/FireRed?

Comments

I'd say "Whenever you feel like evolving it". If you feel like evolving it when it learns a decent enough move, then go for it. Don't let us tell you when to evolve your Exeggcute into Exeggutor. You evolve him/her when you think the time is right.

Answer 1

The last good move it learns by level up is sleep powder, which it learns at level 37. Therefore, you should evolve it at level 37. I think it should know reflect, leech seed, confusion, and sleep powder when you evolve it.
source

Comments

What about TMs? Aren't they important? I feel they are. I have an Alolan Exeggutor that knows Dragon Hammer, Thief, Infestation, and Energy Ball.

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Both Exeggcute and Exeggcutor had the same TMs during gen III FR/LG, albeit Exeggutor also has hyper beam.

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What about teaching it Pshycic instead of Confusion?

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You can teach it psychic whenever you want, including after it evolves. The four moves (reflect, leech seed, confusion, sleep powder) assume you don't like using TMs.

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Energy Ball does not exist in FR/LG as that was'nt introduced until D/P/P.

Answer 2

I would personally recommend Level 43 if you are playing FireRed or LeafGreen as Exeggcute learns Solar Beam then, and you want your Pokémon to learn the strongest attack before exposing the Exeggcute to a Leaf Stone.

Comments

Solar beam's charging turn makes it a lot less useful. Venusaur and giga drain Exeggutor are both better than solar beam Exeggutor.