Whitebeard
Whitebeard's bounty was never revealed.
No, you might be thinking of Alice in Wonderland
The previous members of the Yonkou were - 'Red Haired' Shanks, Whitebeard, Kaidou, and Charlotte Linlin, aka 'Big Mam'. Whitebeard has since been killed, but after the timeskip, Blackbeard is now considered the fourth Yonkou after Whitebeard's death.
They haven't explained 'how' just yet. The only thing we know is the Yami-Yami no Mi is partly gravity-based, so 'pulling' the power from Whitebeard is one possible answer.
Wizard Whitebeard is on a quest to complete a very important spell, and he can be found deep in the heart of the Enchanted Forest in the story "The Incredible Paper Chase."
he is 45,000,000 feet underneath the earth's surface
it is above the head of wizard whitebeard
Wizard Whitebeard doesn't always join Wally (Waldo) in his adventures. Though he often does join Wally (Waldo) and the rest of the gang. He first appeared in the 1989 book The Great Waldo Search. Fun fact: Whitebeard often appears with his scroll, which he often loses!
Go to the right upper corner. Look for the boat with green and white striped sail. The wizard is in it.
Bottom left corner. Right side of bubble. Next to the green alien that's passed out on the floor.
near the ball being popped by the green umbrella it is to the left of it by the man carrying a blue umberella
he's in the upper right corner just below the brazillian flag. have fun!
Wizard Whitebeard can be found in the "Where's Wally Ski Slopes" book on the ski lift wearing a green robe and holding a red book. Look carefully around the ski lift area to spot him among the crowded scene.
Whitebeard
Bottom left corner. Right side of bubble. Next to the green alien that's passed out on the floor.
He is below the white hand below the umbrella splatter cake - just a small head and hat visible.