Several places seem to report that low-IV shadow is a better attack than a high-IV non-shadow of comparable level. I won’t claim to grok the numbers underlying that observation; but one of these days I’ll try to look closer at it.
Regardless, I wouldn’t want to tangle with your maxed-out shadow machamp.
I’ve never payed much attention to the Legendary Pokémons on the game, since I don’t want to put in the effort in them that is required compared to other Pokémon.
The Regis however is an exception, since I like tanky Pokémons with high Defense/Stamina, and I think it is where they shine.
Also I’m a hoarder of Rare Candies, but in the end I felt like I had to put some to use since they took up unnecessary bag space.
Leveled up for Lugia since I know I’ll be needing some Electric-type power against Lugia’s bulkiness.
Leveled up to join my Virizion team. This is the first time I’ve had all three Legendary Birds leveled up, so I’m quite happy.
I’ll wait one more week before posting a new list.
Maxed the top shadow Mewtwo from both accts. Can’t wait for the next event that allows us to TM away from Frustration… 
While it won’t be used against Azelf or any other of the Lake Trio, I decided to level up one of my newest perfect Ghost types.
We will wait another week before a list update since the Lake Trio will only be around for a week.
That makes a grand total of maxed out Pokemon: (with italics being shiny and bold being a 100% IV and blue lucky )
91% Mewtwo
91% Groudon
91% Garchomp
98% Dragonite
91% Tyranitar
84% Metagross
93% Melmetal
100% Gyarados
100% Mamoswine
80% Gyarados
91% Snorlax
100% Espeon
91% Espeon
93% Glaceon
96% Vaporeon
100% Gardevoir
98% Gardevoir
98% Machamp
96% Machamp
98% Golem
96% Charizard
100% Sceptile
89% Blissey
100% Venusaur
98%Jynx
98% Medicham
98% Umbreon
93% Togekiss
96% Swampert
80% Milotic
87% Beedrill
The recent launch of levels beyond 40 seem to present us with a choice for posts to this thread, as “MAXed Out” and “L40” are not the same, any more.
Well, it is still the highest you can get to without the ridiculously expensive XL candies
Its going to be quite awhile before I’ll get anything Powered up to L50.
We now have the old MAX (40) and New MAX L(50).
Both are worthy topics as L40 Pokémon are Dust and Candy which are both readily available.
L50 Pokémon are much harder to achieve atm with limited ability to collect XL Candy.
Kudos to the first person that Powers something up to L50. My Pidgeot is currently L42.5.
I’ll give it more time before starting that topic otherwise it will just end up buried behind a few 100 topics.
Keeping the level 40 topic seems like a fine choice since it’s quite a threshold of its own. I was holding off on posting anything in case this topic was going to get shuttered, but here’s two new ones I leveled up a week ago: one for the Level 41 qualifications, and the other because it was a Fire-type I would like to use soon.
Charizard (1 Shiny, 1 non-Shiny)
Blastoise
Beedrill
Pidgeot
Raticate
Raichu
Sandslash
Nidoqueen
Nidoking
Clefable
Ninetales (Alolan)
Dugtrio
Arcanine
Poliwrath
Alakazam
Machamp
Victreebel
Golem
Muk
Cloyster
Gengar
Electrode
Exeggutor (Purified)
Exeggutor (Alolan)
Marowak
Hitmonlee (Purified)
Pinsir
Gyarados
Lapras
Vaporeon
Jolteon
Flareon
Omastar
Kabutops
Aerodactyl
Snorlax
Articuno
Zapdos (1 Shiny, 1 non-Shiny)
Dragonite
Moltres
Mewtwo (Lucky & Shiny)
Typhlosion
Noctowl
Crobat
Ampharos
Sudowoodo
Politoed
Quagsire
Espeon
Umbreon
Steelix
Granbull
Scizor
Heracross (Lucky)
Houndoom
Kingdra
Donphan
Blissey
Raikou
Entei
Tyranitar x2 (One Shiny, One Non-Shiny )
Lugia
Ho-Oh
Sceptile
Blaziken
Swampert
Ludicolo
Shiftry
Gardevoir
Breloom
Hariyama
Aggron
Medicham
Manectric
Sharpedo
Camerupt
Flygon
Altaria
Crawdaunt
Banette
Absol
Walrein
Salamence
Metagross (Purified)
Regirock
Regice
Registeel
Latias
Latios
Kyogre
Groudon
Rayquaza
Torterra
Infernape
Empoleon
Luxray
Roserade
Rampardos
Mismagius
Honchkrow
Garchomp (Lucky)
Lucario
Toxicroak
Abomasnow
Weavile
Magnezone
Rhyperior
Electivire
Togekiss
Yanmega
Leafeon
Glaceon
Mamoswine
Dusknoir
Froslass
Dialga
Palkia
Heatran
Regigigas
Giratina (Origin)
Darkrai
Unfezant
Gigalith
Excadrill
Conkeldurr
Scolipede
Darmanitan
Darmanitan (Galarian)
Escavalier
Chandelure
Hydreigon
Terrakion
Reshiram
Zekrom
Genesect
Melmetal
and mega form 
