Route 21 is best, but you could also try route 28 and 44.
Hope I helped!
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Yes; Tangela evolves into Tangrowth by leveling up Tangela when it knows Ancient Power.
Teach it Ancient Power and level it up to level 33.
Yes, you can. Or, I think you can, but there are wild Tangela in HeartGold, and they evolve when they learn ancient power, around Lv30+ -Noah Garton, age 10
It is outside of Mt. Silver, in Route 21, 28, and 44, or use Headbutt on trees at Fuchsia City.
It can evolve as early as Level 33 in Pokemon Diamond, Pearl, Platinum, HeartGold and SoulSilver but it needs to know the move AncientPower.