Missing weapons?

[Dokta_Whawee]

So basically, I am nearly at the end of the game, and the weapon archive is almost complete, but I am missing 3 weapons. Where would those be?

[Korby]

You are missing Spark Chaser, Sakugarne, and Mega Ball.
The first two are acquired in the last level of the game, and Mega Ball is found in the same way as Sakugarne.
Unlock Methods:

(click to show/hide)

Spark Chaser is acquired automatically, so you don't have to worry about getting it.
Mega Ball is found by using Rush Search on Jupiter's stage and then completing it. You will have to use some form of mobility to acquire it.

Sakugarne is found by using Rush Search on the Wily Star and then completing it.