Mega development
Unfortunately, there are not any Pokémon that is capable of a mega development, including the matching Mega stone in the normal course of play. Here is a brief overview (status: Ver.1.1.4).
Pokémon with matching stone:
009 But ear - 15 trains
010 Mega-ear - 15 trains
019 Kangaskhan (Kangama) - 15 trains
020 Mega Kangaskhan - 20 trains
024 Sableye - 15 trains
030 Mega-Sableye - 20 trains
045 Mega- Mawile (Lahmus) - 23 trains
051 Mawile - 3 Trains
052 Lopunny (Schlapor) - 5 trains (only 3 Pokémon)
060 Mega-Lopunny - 20 trains
069 Slowbro (Lahmus) - 7 Trains
075 Mega-Altaria - 20 trains
090 Mega-Mawile - 20 trains
105 Mega-Ampharos - 20 trains
108 Glalie - 15 trains
118 Altaria - 15 trains
120 Mega-Glalie - 20 trains
125 Gengar - 15 trains
130 Ampharos - 50 trains
135 Mega Gengar - 20 trains
150 Mega Mewtwo Y - 23 trains
Z20 Mewtwo - 120 seconds
Stones are not available in the normal course of play
104 Aerodactyl - 15 trains
137 Pidgeot - 15 trains
143 Scizor - 15 trains
148 Heracross - 15 trains
Z01 Absol - 60 seconds
Z03 Lucario - 120 seconds
Z07 Venusaur - 60 seconds
Z08 Blastoise - 90 seconds
Z09 Charizard - 60 seconds
Z11 Sceptile - 60 seconds
Z12 Blaziken - 30 seconds
Z13 Sumpex - 60 seconds
Additional stage
If you kill enough 'normal' Pokémon rank S, you can switch with the addition of up to 20 new levels of free (as Ver.1.1.4)
In contrast to the normal steps you have unlimited trains, but does a countdown.
The basic catch rate of all additional Pokémon is 1% and increases depending on the time remaining.
01 Absol - 60 sec
02 Rotom - 60 sec
03 Lucario - 120 sec
04 Arktos - 120 sec
05 Zapdos - 30 sec
06 Moltres - 60 sec
07 Venusaur - 60 sec
08 Blastoise - 90 sec
09 Charizard - 60 sec
10 Dragon - 120 sec
11 Sceptile - 60 sec
12 Blaziken - 30 sec
13 Swampert (Sumpex) - 60 sec
14 Entei - 15 sec
15 Suicune - 15 sec
16 Raikou - 15 sec
17 Heatran - 120 sec
18 Xerneas - 60 sec
19 Yveltal - 60 sec
20 Mewtwo - 120 sec
New Mega Stone
With the update to version 1.1.9, the number of normal levels was increased to 180.
The final stage is now mega-Aerodactyl.
Defeat her to get the matching Mega stone for Aerodactyl (stage 104).
Banette (Level 177) has no Mega stone.
There will also be in a future update Steelix and Tyranitar, who will be able also to mega development.