Parasect Both are dual types, but there really isn't a decent single type Bug in the game. Scyther is definitely one of the coolest looking Bug types in the game, and it's fast as well. I like using it just because it looks great. Sadly, it learns NO Bug technique at all. Parasect only learns Leech Life (a rather weak Bug attack), but it can use some good status-altering techniques that may help you get the upper hand in a duel with a Psychic. Rock Talk about a niche Pokémon type. All Rock Pokémon are dual types and there are only two Rock techniques in Blue, Red or Yellow -- Rock Throw (decent) and Rock Slide (good). Rock is great against Fire, Ice, Flying and Bug Pokémon, but it also add plenty of weaknesses to whatever type it's paired up with. Best Pokémon: Aerodactyl, Golem, Rhydon Golem is a no-brainer, but you may also want to look into the flying dinosaur Aerodactyl. It's weak against Electric attacks, just like other Flying types, but it's got amazing HP, Attack and Speed stats. On the downside, it doesn't learn any Rock techniques... Doh! Rhydon, on the other hand, can learn Rock Slide. This rather strong Ground/Rock type has high Defense and Attack stats, but because of its low Speed rating it's recommended only for trainers who have a lot of time to level-up almost all their Pokémon. Ghost Another rare type, Ghost Pokémon also only exist in dual form. All three Ghosts in the game are dual Ghost/Poison types. On the upside, the dual Ghost nature doesn't really add any new weaknesses. It actually makes the Pokémon immune against Normal and Fighting attacks. Not bad at all. Sadly, there are also only three Ghost techniques, two of which are decent (Confuse Ray and Nightshade). But Ghost techniques are only strong against other Ghost Pokémon, so you should probably just teach your Ghost Poison and Psychic techniques instead. Standard Poison technique: use Toxic together with Confuse Ray or a Sleep move. Best Pokémon: Gengar Gengar all the way. This Ghost not only looks awesome (anyone else think he looks like the Nekobus from My Neighbor Totoro?) but also has great stats. Use the Hypnosis/Dream Eater combo to drive your opponent mad. Dragon This rare Pokémon type can be a powerful foe -- but one Blizzard hit usually spells doom for even the most powerful Dragon. The only problem with Dragon types is that there is only one single Dragon technique in the game, Dragon Rage (deals 40 damage). I personally don't like using Dragons, but they can be a pain if your opponent has one and you don't have an Ice type. Best Pokémon: Dragonite It's a toss-up. Do you want a really powerful Flying Dragon who is susceptible to Electric, Rock and Ice attacks or a less amazing fighter who is susceptible to Ice only? In the end, Dragonite's stats are just too good to ignore, making its pre-evolution Dragonair a less popular choice. Rental Pokémon A quick word of warning about Rental Pokémon. A Level 50 Rental Pokémon will never be as good as a Level 50 Pokémon trained by yourself. Take for example a Level 50 Zapdos you can rent in the Poké Cup. It knows Thunderbolt, Thunder Wave, Flash and Sky Attack. Thunder Wave and Thunderbolt are good moves, but imagine the moves selection you could put together... Apart from the fact that you could enter a Level 55 Zapdos had you trained it yourself, you should also know that Zapdos learns its strongest Electric attack (Thunder) at Level 51. Sky Attack is a powerful move, but it takes a round of preparation, which allows your opponent to switch Pokémon or attack you. Fly would be a much better two-part attack. The same holds true with almost every Rental Pokémon in the game. While the selection of moves is one thing, it's really the stats that differ the most. You can still get through most of the game by using Rental Pokémon only, but that means you will also miss out on many of the exciting features that Pokémon Stadium has to offer. And once you unlock the R-2 Mode, you will also quickly notice how limited the Rental Pokémon are in comparison to the CPU's. Your best bet is to only use Rentals if you don't have a Pokémon of a particular type (or level).