

Why does the damage calculator get Mega Sol wrong?
The first picture is a base Mega Meganium using Solar Beam on a base Pelipper with no weather:
0 SpA Meganium-Mega Solar Beam vs. 0 HP / 0 SpD Pelipper: 237-279 (90.8 - 106.8%) -- 43.8% chance to OHKO
The second picture is that same set up but in rain:
0 SpA Meganium-Mega Solar Beam (60 BP) vs. 0 HP / 0 SpD Pelipper in Heavy Rain: 118-141 (45.2 - 54%) -- 44.1% chance to 2HKO
in showdown there is no difference between the two, I tested and they do the same amount of damage, why is it so different on the calculator? Has Mega Sol not quite been put in place properly?