For everyone who is complaining about not being able to find a ROM hack because you don't use Windows (Mac user here!), I can tell you how you can figure out how to download Rocket Strike on your own. You'll need to have some basic knowledge of HTML to know what you're looking for but it can be done (I just did it). Before we start and just so you're clear, Vizzler won't be of any use, so don't try this with their site.
First, try to find a site that has the ROM that you can play in the browser (i.e. with a Flash-based emulator, etc).
Second, right click and select "Inspect Element" in Chrome (if you don't have Chrome, Safari and Firefox have similar functions) somewhere near the player.
Third, try to find the emulator. If you're using Chrome, this is easy because whenever you hover over a tag, it will highlight it for you.
Fourth, if the Emulator is a Flash-based emulator, you'll want to look for a tag like this (but, with brackets around it).
param name="flashvars" value="system=gba&url=/gba/Pokemon_Rocket_Strike.zip"
If you've found it, you're almost there! The last step is to apply that URL. I highlighted the URL for the ROM in Bold but it's relative to the path that you would need to use to find it. So, if you found it at
http://example.fake, your next logical step is to go to
http://example.fake/gba/Pokemon_Rocket_Strike.zip. If you found it at
http://example.fake/sample/, then you can try
http://example.fake/sample/gba/Pokemon_Rocket_Strike.zip or
http://example.fake/gba/Pokemon_Rocket_Strike.zip.
Happy hunting and note that I didn't tell a soul where the ROM is or where I found it. Just how to find it for themselves!