It is possible to get through Rock Tunnel without Flash. If you have good maps or know the way, the darkness makes no difference at all.
It is impossible to buy the Bike without the Bike Voucher. The maximum amount of money you can have is one credit too little. If you get any more, it still says you get it, but the amount of money you have stays the same.
If the current box on the PC is full, the game doesn't let you throw a Pok� Ball.
It is possible to catch Mewtwo without the Master Ball. It actually seems to be easier to catch than the Legendary Birds. It is at a higher level and uses Recover, but the balance of its stats is more favourable, and it can be caught with a higher proportion of its HP left than the Birds. The Parasects in the Unknown Dungeon are quite good for catching it.
A Pok�mon will have higher Attack, Defense, Speed, Special and HP if you train it from a low level than if you catch it at a high level or use Rare Candies.�
Protein, Iron, Carbos, Calcium and HP up are best used on your Pok�mon before you start training them. An untrained Pok�mon will be able to take ten of each, and though the effect will appear small, it will increase as the Pok�mon grows. A trained Pok�mon, however, will be able to take less, and as each will give the same effect as if they were given earlier, the overall effect will be less. Ten of each is the maximum that any Pok�mon can ever take. Unlike training, using Rare Candies does not reduce the number the Pok�mon can take.
The timer that measures how long you have been playing the game stops when it reaches 255 hours.