So Crystal_ just dropped this bomb on us, and he's basically the one dude in the world that knows RBY cart mechanics down to the machine level, and fully appreciates their importance in high-level RBY play. Needless to say, it's probably legit.
Basically, in-cart, Normal-types are immune to Body Slam for the same reason that Fire-types are immune to Burn, Ice-types are immune to being Frozen, and Poison-types are immune to non-Twinneedle Poison. The RBY gods, in their infinite wisdom, decided to implement these reasonable restrictions by setting things up so that NO move of the same type as the attacked Pokemon may inflict a secondary status effect. This means that Body Slam cannot paralyze Normal-types, and Lick cannot paralyze Ghost-types. Pure-status moves such as Toxic, Thunder Wave, and Stun Spore seem to have their own pure-status handler and therefore are not subject to this oversight (so no XY-style immunity to Twave for Electrics, nor immunity to Powders for Grasses).
Needless to say, this is a pretty big deal, mostly because of Normals being immune to Body Slam. In particular, Snorlax and Tauros may now have better options for their main STAB, as one of Body Slam's main perks is being able to paralyze opposing Snorlax and Tauros in the oh-so-common dittos. Granted, there's still value in Snorlax being able to para Egg/Lapras/Golem, and in Tauros paralyzing stuff like Starmie and Alakazam, but now that Body Slam is just a weaker variant of Double-Edge (or even Mega Kick in Snorlax's case) in dittos, there's probably a legitimate reason (rather than gimmicky reason) to consider using those moves instead. Also, an unparalyzed Chansey now fares a ton better against these dudes without having to fear being paralyzed by Bslam.
Crystal_ can clarify where I might be slightly inaccurate, but the most important bit is the Body Slam thing. SPL RBYers, be aware!
EDIT: there's also the other thing Crystal_ found describing how, precisely, stat changes are handled in conjunction with status, thereby giving rise to Agility canceling out paralysis Speed drops. In particular, a paralyzed Amnesia Slowbro could spam Amnesia against a foe that, itself, is paralyzed, thereby compounding the paralysis speed drop and obtaining the Speed advantage.
Basically, in-cart, Normal-types are immune to Body Slam for the same reason that Fire-types are immune to Burn, Ice-types are immune to being Frozen, and Poison-types are immune to non-Twinneedle Poison. The RBY gods, in their infinite wisdom, decided to implement these reasonable restrictions by setting things up so that NO move of the same type as the attacked Pokemon may inflict a secondary status effect. This means that Body Slam cannot paralyze Normal-types, and Lick cannot paralyze Ghost-types. Pure-status moves such as Toxic, Thunder Wave, and Stun Spore seem to have their own pure-status handler and therefore are not subject to this oversight (so no XY-style immunity to Twave for Electrics, nor immunity to Powders for Grasses).
Needless to say, this is a pretty big deal, mostly because of Normals being immune to Body Slam. In particular, Snorlax and Tauros may now have better options for their main STAB, as one of Body Slam's main perks is being able to paralyze opposing Snorlax and Tauros in the oh-so-common dittos. Granted, there's still value in Snorlax being able to para Egg/Lapras/Golem, and in Tauros paralyzing stuff like Starmie and Alakazam, but now that Body Slam is just a weaker variant of Double-Edge (or even Mega Kick in Snorlax's case) in dittos, there's probably a legitimate reason (rather than gimmicky reason) to consider using those moves instead. Also, an unparalyzed Chansey now fares a ton better against these dudes without having to fear being paralyzed by Bslam.
Crystal_ can clarify where I might be slightly inaccurate, but the most important bit is the Body Slam thing. SPL RBYers, be aware!
EDIT: there's also the other thing Crystal_ found describing how, precisely, stat changes are handled in conjunction with status, thereby giving rise to Agility canceling out paralysis Speed drops. In particular, a paralyzed Amnesia Slowbro could spam Amnesia against a foe that, itself, is paralyzed, thereby compounding the paralysis speed drop and obtaining the Speed advantage.
Last edited: