Many of the Pokmon within the Dream World will have abilities that the Pokmon you transfer over from Diamond, Pearl, Platinum, HeartGold & SoulSilver don't normally have, such as Vaporeon with Hydration and Glaceon with Ice Body. A few are also available in-game and others through events.
Hybrid cars have smaller, more efficient internal combustion engines than conventional vehicles because the electric motor provides additional power when needed. The smaller engines produce less pollution. Gasoline engines in hybrids automatically shut off when stopped and restart when the accelerator is pressed.
The Volkswagen Lupo 3L turbodiesel and the Audi A2, which use the same engine, have both edged close to 80 mpg. That's better than a hybrid. On the downside, that amazing three-cylinder diesel doesn't meet U.S. emissions standards and the vehicles are Ringling Bros. size by American standards.