Yes it does, although I think it only comes in red, blue, and purple. I have blue. Ask at Walmart-they would know if it comes in orange.

This bike would be the right size for him but I had one and it didn't even last a year it is weak. It should fit him cause i got the same bike for my 10th b-day.

It has gear on both handlebars. Microshift and regular

How it is recommended, he should have a inch inbetween the top tube and his inseam. This isn't always the case though. Take him to a store and try out a few!

Nope, sorry. Walmart use to carry a 20 inch Mountain bike called the Mako but don't anymore. I don't know if they still have 20 inch Mountain bikes.

A bike comes in a box about 5 feet long, 3 feet tall, and about a foot wide. The weight of the bike is 43 lbs (shipping weight).

Finding parts for bikes is amazingly hard. The easiest way to get parts is taking the bike back to your local walmart for repair and they should be able to order and install the parts for you. They might charge you for the parts and they might not. If you decide to take this route, the wait might be long as parts can be on back order and what not.

The max suggested weight limit for a 24 inch bike is 250 lbs. But some bikes can handle more than this. The Powerclimber would be able to hold 300lbs and be fine but I wouldn't go much above that.

You can try and contact Next but I've heard it doesn't usually work. Try walmart, just go in and ask to talk to an assembler. They can order just about any part for a bike and usually have extras in back.

I would not think so, i bent my rims when riding, and weigh 160