Macho Brace is a Hold Item that was introduced in Generation III. The Pokémon that is holding this item earns twice as many Effort Value (EV) Points as it would earn normally, but the holder's Speed Statistic is cut in half as a result.
In the event that the holder of a Macho Brace is also afflicted with the Pokérus, then the holder of the Macho Brace would earn four times the normal amount of EV's instead of the normal double EV's that would be earned with either the Pokérus or the Macho Brace by itself.
Related ThreadsMacho Brace - last post by @ Feb 15, 2013
What do you find inside a Macho Brace - last post by @ Jul 10, 2007
question about macho brace - last post by @ Jun 28, 2007
Macho Brace - last post by @ Sep 2, 2004
pokemon diamond english how to get the macho brace? - last post by @ Jul 17, 2011