Occluded fronts. An occluded front forms when a cold front reaches a warm front, forcing all the warm air to rise to higher altitudes and the cold air is stratified near the ground. At our latitudes, over the Atlantic, cyclonic areas form continuously, these are fed by the Azores anticyclone and the Polar anticyclone.
Pikachu - Raichu. Eevee - Jolteon. As of the IV generation, only two Pokemon will evolve if exposed to a Thunder Stone: Pikachu into Raichu and Eevee into Jolteon. Despite the number of Electric-type Pokemon, only these two require a Thunder Stone to evolve. pikachu- evolves into raichu. eevee- evolves into jolteon.
Alakazam also gets access to Barrier, and if you set it up correctly, Alakazam can survive physical attacks enough to make better use of Recover. It's rather risky, though, and needs to be executed flawlessly or it won't work. Thunder Wave can catch Metagross and Tyranitar on the switch and is a nice alternative.