Is this a fake GBA cartridge?

I don't know. I remember my Fire Red cartridge not having semi-transparent plastic.

Well, they look real..
the colour of the cartridges is the same as the retail ones.

Too low resolution to tell for sure. Try asking the seller for a better image if you want.
Also clicky.
EDIT: one sign to tell if the game is real that wasn't mentioned, there should be a faintly visible two-digit number pressed somewhere on a sticker. Ask the seller for a picture that includes that too.

I had ruby and firered just like those. Already sold them though, so I can't compare them for small details.

Image is too small to tell, but it's located in Europe, yet it uses the ESRB instead of PEGI.
It's possible the seller moved from NA, but since NA has more consumers than Europe does so it'd make sense to fake the NTSC version.

Edit: Seller is using the same image on a different auction that has multiple copies. Avoid it

ohhh <3

FAKE.

See that little Gold icon above the reference codes? Real carts ALWAYS have those on different sides of the sticker.

they are fakes. i had the same problem a while ago when i bought some

hmm, I think fake but I aren't sure alot of semi-transparent plastic GBA cartridge are fake, not sayin' all of them where fake thing is some pokemon games are made with semi-transparent cartridges, not all of those though. It also depends on the country where they were made

It's a bit hard to tell with the size but I think the leaf green's coloring is off. Luigi mansion 2 looks like a reprint to me which makes it sound even less legit.

I've been trying to get some of the GBA pokemon games for myself as I skipped the GBA and went straight to the DS. If your in Europe the games shouldn't have an ESRB rating on them as its only used in NA, the majority of the time these cartridges will be fake. If a seller on eBay or any other auction site is selling them in bundles and has a large number of them for sale they are going to be fake as well. It's better to try and buy them separately and from someone who isn't selling a bunch of them, it may be more expensive but you should always get a legitimate cartridge.

OK, maybe they are fake. The seller has this listing with Chaos Black.. :/ as well as a ton more pokemon games to sell. be careful

as far as i can tell it doesnt matter. I have once bought on ebay a gameboy advance sp game. It was not an official one but a fake. However it all worked for me.

In first option you should ask a seller to more photos on your mail. Also important is a details like back side of cardridge and what exacly look a Game Boy Advance Logo. Also important is that it should have a nintedo sign inside in cardridge (up of the golden sticks)

I would ask, I've personally been stuck with Counterfeit GBA games before when buying from Ebay. Best thing you can do is ask, and then pay with paypal, they had my back for the counterfeit product.

No i have the sapphire version and its same as the picture

Looked through eBay and try considering using this seller.
Here's a list of his Pokemon games
He doesn't use stock photos, as you can tell all his photos are different, not only that but they're not the NTSC version either, has tons of legit copies of games on auction/buy it now, and has good reputation.

From the picture, they look legitimate. I have the same games next to me for comparison and the labels are the same. However, that's not to say the seller isn't using a real picture to promote fake carts. It could also be that the labels are printed proper, but won't contain the code imprint in the label, which can't be seen at that resolution.

There are multiple tells for spotting a fake:

• While not a requirement, most carts have "Nintendo" or the oval nintendo logo printed on the board just above the pins. Not being there isn't an instant tell, but warrants further scrutiny.
• All labels have at least the Nintendo "red oval" logo. The gold seal is actually optional, as games can be approved for Nintendo systems, but not carry the approval logo. This is rare, but possible.
• When a label does have the gold approval logo, the ink in it is actually metallic and should glitter, though older labels will fade to yellow or even the green of oxidized copper.
• All labels will have a non-inked code physically stamped into the sticker, between 2-4 characters long, and be either numeric or alphanumeric. These are hard to see on pictures and tend to wear out of old labels, but are ALWAYS present during the life of a legitimate cart.
• All labels will have a segmented, alpha or alphanumeric code designating its region, system, and game. For example, a USA copy of Pokemon Ruby is AGB-AXVE-USA.
• All labels will contain the intended region's rating logo.
• All labels are made from glossy sticker stock.
• The front of the cartridge is embossed with "GAME BOY ADVANCE". The "advance" is smaller lettering, and the A's in "advance" are stylized with breaks in the cross.
• The back of the cartridge is embossed with the oval Nintendo logo, the model of the casing ("MODEL NO. AGB-002" for standard sized carts), and "PAT. PEND. MADE IN JAPAN". There are claims that late age carts might have had MADE IN CHINA, but I've never heard of one sighted in the wild.
• Both the front (under the label) and back of the cart have a round dip.
• The cartridge is ALWAYS held by a tri-wing screw from the back.

Knowing this, fakes can be easily spotted. Producers tend to use off names, like "Nontendo" or "Game Bro Advance", miss logos, miss the front and back dips, or use any screw except a tri-wing, and almost never have the physical code imprint in the label. Beyond that, the cart might be perfect, but the rom might be wrong (a salvaged case with a USA label code that boots to an EU translation, for example).

If you're worried, I'd skip it. But if you get them, identify them. If they're fake, report to eBay and you'll usually get your issue rectified.

Not sure about ebay's TOS because I cbf reading them, but if they turn out to be fake, you can always reverse payment/start a paypal dispute (lol).