How to Beat the Beetle
When you reach the Beetle, you need to focus on learning the Beetle’s moves, of which it has three.
The first move to memorize is its charge jump. The Beetle will charge at you and right at the last second, right before it looks like it’s about to hit you, it will jump. No matter how scared you might get that the Beetle is about to hit you with its charge, don’t sweat — it will always jump up at the last second. When it does that, you need to jump left or right out of its way. Try to jump whichever direction will put you behind the Beetle’s glowing butt. Attack this glowing butt when you’re behind it.
The next move the Beetle will use is another jump move. Basically, instead of charging at you, the Beetle will jump up in the air and slam its body down onto you. Jump out of the way, again aiming in the direction that will put you behind the Beetle. Don’t attack just yet, though. The Beetle will jump one more time. After the second jump, attack.
The third and final move of the Beetle to know is its flame attack. When you see the Beetle charge up, it’ll unleash a fiery blast a few seconds later. This fiery blast travels along the ground so when it gets close to you, jump up and over it in the direction of the Beetle. If you jump backward, you’ll likely land in the fiery blast that’s still traveling along the ground.
You won’t be able to attack after this move so just wait until its next move whcih will be the charge jump. The Beetle always uses its moves in this sequence: charge jump, second jump move, then its fiery blast. Attack the Beetle’s butt until you get its health bar down all the way. When you do that, you’ll have defeated the Beetle and the Beetle Boss Fight will be over.