I do not own Pixelmon, Pokemon, or anything with the franchise or mods I uploaded this due to request and the fact I haven't had any which have actually worked for me.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (4.2.7 w/ Optifine) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select 4.2.7 w/ Optifine from the list on the left. The launcher will handle everything else!