I haven't heard of this, and to me it doesn't make that much sense.
As I understand it, people use Toad for two purposes: as an add-on to another deck to buy time to set up, or as the means to put a lock on the opponent and keep it on.
I don't think you would use M-Manectric Seismatoad along the first lines, just because M-Manectric is such a powerful starter itself. It's very plausible to hit a T1 overrun, a T2 assault laser and then a T3 turbo bolt, and also accelerate some energy. And you wouldn't lead with Seismatoad while building up an M-Manectric on the bench.
For proper lock decks, M-Manectric just doesn't seem a good partner. Because you need to quaking punch every turn people want something that can support from the bench (via abilities). That's why Slurpuff and Garbador are the most popular partners. And why people also look at Delphox and even Magnazone. These either increase the power of the lock, let you draw more cards to disrupt your opponent, or let you play more cards to disrupt your opponent.
My two cents, anyway.