Complex sentence: However, after being cured, the Pokemon will still retain the effects of the virus and (in Ruby/Sapphire and later games) will have a small black dot on their summary screen next to the image of the pokéball it was captured in.
Split into simpler sentences: However, after being cured, the Pokemon will still retain the effects of the virus. In Ruby/Sapphire and later games, the dot is in their summary screen next to the image of the pokéball it was captured in.