While traveling Jack thought about the next pokemon he is planning to capture.
In this life Jack knows he will have to face many stronger opponents and if he fail to overcome than his dream of best will shatter. He needs to make a plan if he wants to be strong. Specializing in one type is a great option. Although they are easy to counter but there is a big advantage. The breeding method will not differ too much and they can develop more tactics. In real life it is not 1 vs 1 so they need to work together and combine other attacks. Example move like toxic spikes, heatwave, surf will also hurt teammates of other attributes and there is a probability of own attacks neutralizing each other before they reach the enemies.
Weather team is a great way to defeat stronger opponents. It can increase the power of allies and cause problem for opponents. Fire type is a good choice because the combination of fire is definitely hotter than fire from single pokemon. With sunny day you don't need to worry about water types and you can also pair them with one or two grass types which can solve the problem of easy to counter. Grass can counter the weakness of fire types which are water, ground, rock. Plus their strength will also improve in sunny day weather.
Jack knows something about grass pokemon that no other knows. He accidentally discover this in the first life. Every pokemon which has green leaf on their body can develop Chlorophyll ability even if the species can't learn it. Although it is as strong as the original addition to their respective trait they are a lot more stronger opponents than others.
After thinking for a long time Jack decided to go this direction because the light blue aptitude egg that he is planning to find is also that of fire type. Also, the improvement of the aptitude of types like fire, water, ice, grass, ghost are not hard. You just need top grade or peak grade evolution. During evolution if you let those pokemon devour energy from top or peak grade evolution stone or go to places where their respective energy is intense, the aptitude will be improved. Top great stone can improve its aptitude by one stage and peak great stone can improve by two.
Other attribute needs special medicine or secret method of powerful families. Improving aptitude of dragon is hardest because its needs outrage scales and bones of dead dragon combine with special medicines. As for what medicine only Lance and other ancient dragon families knows.
The only problem is peak grade evolution stones are hard to find and no amount of money can exchange for it. Only with item with equivalent value you can exchange for it. Even in team rocket store, there are only top grade stones and the price are same as pseudo legendaries. It will depend on his luck if he wishes to find one.
Although he decided he will go into sunny day team direction, he still needs some essential pokemon. Pokemon that can develop, ghost type pokemon that does not consume life force and live in his shadow, water type to travel in water. He will still get atleast one pokemon of these 3 types which can improve his survival. Among these three psychic is rarest and psychic pokemon that knows teleport is rarer than dragon and their price is as same as pseudo legendary pokemons.
After an hour of traveling he arrive at the place. He also avoids pokemon this time because Zubat is still two weeks old and is not suitable for combat yet. He needs to first improve its body for atleast 3 days before he can fight. Now it is time for training.
Zubat have great combinations of attributes. Poison is deadliest and flying is fastest. Jack knows how to improve his main attribute but he also needs to improve zubat flying type. Every pokemon main attribute is more dominant than secondary but what Jacks wants zubat to balance both flying and poison. Because zubat needs to focus on training speed so flying energy is very important and zubat needs to focus on flying energy to improve its speed. To balance that although it is impossible for normal people with Jack eyes he can still achieve it. For that zubat needs to devour flying type energy during evolution.
The dual type pokeblocks he bought are mainly to improve speed and has more energy of flying than it is of poison. They are more suitable for flying as main attribute but Jack can balance it by devouring poison sags of poison type pokemons. For poison he plans poison sags of pure type pokemons or pokemon with poison type as main attribute since their poisons are more potent, they work the best. There are only 8 kinds of pure type and 6 kinds of poison type main attribute pokemons. But Jack only needs 12 type of poisons to get the best effect. If you let zubat devour anything more than that it will reverse their effects by neutralizing each other and worst case scenario it will even downgrade zubat potential.
Jack is ambitious and he not only wants to improve the potential he needs to make poison of his zubat the deadliest which cannot be cure even with best antidote. In previous life, after one of the most intense battle with Alliance, on of the executive of poison type does not survive and dies but he takes many of Alliance members with him. Jack is one of the lucky survivors and he found this method of making deadliest poison on him. Yes, that executive is Koga, best poison executive of team rocket and even he has not try this method yet because it needs highest technology. Luckily Jack has both method and technology right now. The method can only work if the pokemon is already absorb 12 types of poison. He needs to make another portion of poison and mix it outside proportionally and after that let the pokemon devour it. The reason it needs highest technology is that it needs precise amount and if you are wrong in mixing even a tiny bit those poisons will neutralize each other, in worst case it will explode and death is the least to worry about. Without the scanning even the developer Koga cannot make or dare to make this poison. So right now he needs 2 poison sags from 12 types of poison pokemons.