Spyro 2: Ripto's Rage

Orb on Secret Ledge in Summer Forest
To get that orb at that ledge you saw at the last pillar of Hunter's challenge, you need to go back at the portal leading to Glimmer and then dive in the pond. Follow the path, while collecting the treasure then go up the steps and get the orb.

Orbs in Autumn Plains
To get one orb, you need to find Elora and talk to her. She is supposed to say something about a whirlwind being activated by orbs. You should collect enough orbs to activate it. When it's activated, go up then glide to the ledge.
Go all the way to the end wall then charge it to get one orb.

To get the other orb on the faraway ledge, climb the ladder near Moneybags then climb those two ladders that leads to the portal near Scorch. Go through to the tunnel and charge the cracked wall. Go up the whirlwind, collect the treasure then go up the next whirlwind. Make a very long glide to the ledge and finally get the orb!