Elixir

Elixir is an anti-virus program created by E.A.R.L.. It is probably one of the best anti-virus programs ever created, and is so far the only one that can stop 50Mb13.

Possesors
As far as anybody knows, only The Hunter and E.A.R.L. have Elixir. It is said that one day one powerful BAIR with Elixir will come and defeat all of 50Mb13's strains using Elixir, and then recreate all the deceased robots.

50Mb13
While some can slow it down, so far Elixir is the only anti-virus program that can stop 50Mb13, AKA Recon. The Mascots have tried to create various programs that would stop Recon, but to no avail.