I was under the impression metroid works with a 2mbit flash saving game in the DS slot, you might also want to try prepatching with EZ4Client.
You can grab a list of 2mbit flash saving games at ADVANsCEne:
http://www.retrocovers.com/advanscene/ Click advanced search, tick NDS release, change the search for box to Save Type, enter no quotes "Flash - 2 Mbit" in the box and hit search.
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