Catching a deep green pidgey, you have to atleast save a world three times if you want that kind of luck. It is very depressing to think about it so Jack does not think about it anymore.
As for the other guy, Jack hasn't seen him in the orphanage so he is probably relative of team rocket members. Although Jack does not interact much and spend his days training in orphanage with his eyesight and memory he still knows which one is from orphanage and which is not.
His pokemon is poochyena of green aptitude. After seeing his pokemon aptitude is green Jack does not bother to scan his abilities. His opponents are pokemon with deep green or higher. Yhere is only one stage apart between them but the difference is as clear as day. But still, for normal people, it is very hard to even find green pokemons let alone catch and tame them. But relatives of team rocket have a better starting point than most people. They already know the information in advance on pokemons they want to find and catch. As well as method and tools in catching and training. The higher the position of their relatives the stronger aptitude pokemon you can get. They do that in order to monopolize the rewards in the trial.
You cam assume the position of their ranks by looking at the aptitude of their pokemon. As for that guy, his connection is at the highest Captain so nothing to worry about.
All the five people I met today will probably become the strongest five among the participants of this island. It is very difficult to surpass them unless they got a deep green aptitude but normal people will probably hard to find unless they luck is exceptional like Mary or if they have can check aptitude like Jack. Even light green aptitude are very hard to find let alone higher ones. So everyone who can catch and tame green aptitude pokemons have great potential and if they were to survive their future is secured.
Aptitude is the most important for pokemons, pokemons with higher aptitude have can learn moves fighter and stronger in less time. Maximum effort with minimum effort. They generally have higher intelligence and higher battle instinct. Thats why it is very important to raise pokemon aptitude.
Normally it is very hard to raise aptitude and information on improving certain type of pokemon is the secret of most powerful family. You cannot buy them even if you have infinite amount of moneys. Each pokemon type has different ways to improve their aptitude and only family which know the secret can rise up to top of the world. Owner of the Devon Corporation, Stone family knows way in improving rock types and steel types. Lance family knows in improving dragon types that why they can have ownership to dragon lair.
But luckily Jack knows the way to improve the aptitude of his zubat because zubat is the poison type. Among the 18 types, the easiest ones to promote attribute is pokemon of poison types. Thats why most dark organizations use poison as their main force. It is a secret and it is forbidden because the process is too cruel. But as former elite captain of team rocket himself, Jack knows the information.
The ways in improving aptitude of poison type pokemons is making their poisons more potent. In order to do that they need to devour many types of poisons including from poison type pokemons to make stronger poison which will improve their aptitude.
In ancient times, some people used this method and put all kind of poison type pokemon in some place. They locked them and make them kill each other. For survival pokemons have no choice but to devour others. In the end their is only one winner and sometimes all of them died. But the aptitude of last one standing pokemon improve a lot. The increase in aptitude depends on different types of poison sacs they devour. If they devour poison of every pokemons it is said that no antidote in the world or no other spells can cure it. Team rocket discover this secret first from some ruins which make them what it is now, strongest dark organization in the world.
Same process can be done with bug types but it is not as effective and it will take much longer than poison types. Each pokemon types has its perks and downfalls. For bug types their growth rate is very strong but so is their life span so Jack does not consider them. Although life spans can be improve by reaching higher levels, bug type life spans are still limited. But they are very good for people who want to become powerful in a short time.
Among pokemon types steel, fairy and dragon have strongest life span. But Jack does not have intention to capture these types now. Steel type live long and has best defense but their appetite is very big Jack cannot afford it right now. Fairy type are not suitable for battle in real life. They are very kind but being kind to enemy is cruel to oneself so Jack does not like fairy. Dragon are strong but their growth rate is slow and until final stage they are not strong and also have same appetite as steel types so not suitable for his first echelons.
Poison type and ghost type are most dangerous as poison type are deadly and most ghost devour life force of trainers or other pokemon surrounding them. As for dark type they are very cruel and mischievous. But those who can train them are strong trainers and they are generally stronger than normal trainer. It is not a problem for trainer like Jack if they can trained from the early stage.