Is there anyone online at the moment who could help me defeat this guy?! I have tried everything but they get me every time!!
Unfortunately, it is a solo quest, so no one can help you defeat him.
Be sure to use traps on Chester. So long as he has one trap on him, it's good. Work on defeating the minions first.
Be sure to pack as much healing as you can in your main deck, and maybe a few sprite TCs just in case. Don't worry about saving pips for a 'big hit', but keep hitting with what you have.
There were plenty of times I didn't defeat him the first or the tenth time, but he can be defeated. Look at what you might adjust in your deck (adding or deleting) that will help you win. At your level, it's all a learning process on what works and what doesn't.